Docker 搭建 Redis Cluster 集羣環境

{"type":"doc","content":[{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"使用 Docker 搭建 Redis Cluster，最重要的環節就是容器通信的問題，這一塊我們在之前的文章中已經給大家解決了《"},{"type":"link","attrs":{"href":"https://xie.infoq.cn/article/97355a6e7ac01bce8532d5ff5","title":""},"content":[{"type":"text","text":"Docker網絡模式詳解及容器間網絡通信"}]},{"type":"text","text":"》，本篇文章主要練習使用多個容器完成 Redis Cluster 集羣環境的搭建，順便爲學習 Docker Compose 鋪鋪路。俗話說沒有對比就沒有傷害，通過對比才能感受到 Docker Compose 的好處 😄。"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"　　關於 Redis Cluster 集羣更多的內容請閱讀《"},{"type":"link","attrs":{"href":"https://xie.infoq.cn/article/fe070dcadf891d3d641132c36","title":""},"content":[{"type":"text","text":"最通俗易懂的 Redis 架構模式詳解"}]},{"type":"text","text":"》。"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"　　"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"heading","attrs":{"align":null,"level":2},"content":[{"type":"text","text":"環境"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"　　"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"　　本文所使用的基礎設施環境如下："}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"bulletedlist","content":[{"type":"listitem","content":[{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"codeinline","content":[{"type":"text","text":"CentOS 7.8.2003"}]}]}]},{"type":"listitem","content":[{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"codeinline","content":[{"type":"text","text":"Docker version 19.03.12 "}]}]}]}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"image","attrs":{"src":"https://static001.geekbang.org/infoq/03/0309ecfc01393c56c1e87247cc673c77.png","alt":null,"title":" ","style":null,"href":null,"fromPaste":true,"pastePass":true}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"　　"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"heading","attrs":{"align":null,"level":2},"content":[{"type":"text","text":"搭建"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"　　"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"　　整體搭建步驟主要分爲以下幾步："}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"bulletedlist","content":[{"type":"listitem","content":[{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"創建網絡；"}]}]},{"type":"listitem","content":[{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"下載 Redis 鏡像（其實這步可以省略，因爲創建容器時，如果本地鏡像不存在，就會去遠程拉取）；"}]}]},{"type":"listitem","content":[{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"編寫 Redis 配置文件；"}]}]},{"type":"listitem","content":[{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"創建 Redis 容器；"}]}]},{"type":"listitem","content":[{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"創建 Redis Cluster 集羣。"}]}]}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"　　"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"heading","attrs":{"align":null,"level":3},"content":[{"type":"text","text":"創建網絡"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"　　"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"　　爲什麼需要創建網絡？因爲：默認的 bridge 網絡是無法使用 DNS 的，所以我們就需要自定義網絡。說簡單點就是爲了讓容器可以直接通過容器名稱進行通信。"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"blockquote","content":[{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"　　從 Docker 1.10 版本開始，docker daemon 實現了一個內嵌的 DNS server，使容器可以直接通過容器名稱進行通信。方法很簡單，只要在創建容器時使用 "},{"type":"codeinline","content":[{"type":"text","text":"--name"}]},{"type":"text","text":" 爲容器命名即可。"}]}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":">"}]},{"type":"blockquote","content":[{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"　　但是使用 Docker DNS 有個限制："},{"type":"text","marks":[{"type":"strong"}],"text":"只能在 user-defined 網絡中使用"},{"type":"text","text":"。也就是說，默認的 bridge 網絡是無法使用 DNS 的，所以我們就需要自定義網絡。"}]}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"　　"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"　　通過 "},{"type":"codeinline","content":[{"type":"text","text":"docker network create"}]},{"type":"text","text":" 命令可以創建自定義網絡模式，默認爲 "},{"type":"codeinline","content":[{"type":"text","text":"bridge"}]},{"type":"text","text":" 網橋/橋接模式，完整命令如下："}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"codeblock","attrs":{"lang":"shell"},"content":[{"type":"text","text":"docker network create redis-net"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"　　"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"　　通過 "},{"type":"codeinline","content":[{"type":"text","text":"docker network ls"}]},{"type":"text","text":" 查看網絡模式："}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"image","attrs":{"src":"https://static001.geekbang.org/infoq/00/0086d870d9540478cf1421714e28e943.png","alt":null,"title":" ","style":null,"href":null,"fromPaste":true,"pastePass":true}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"　　"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"　　我們還可以通過 "},{"type":"codeinline","content":[{"type":"text","text":"docker network inspect redis-net"}]},{"type":"text","text":" 查看 "},{"type":"codeinline","content":[{"type":"text","text":"redis-net"}]},{"type":"text","text":" 網絡的詳細信息："}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"image","attrs":{"src":"https://static001.geekbang.org/infoq/86/864cc532a8fa020da84fc38297a4c623.png","alt":null,"title":" ","style":null,"href":null,"fromPaste":true,"pastePass":true}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"　　"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"heading","attrs":{"align":null,"level":3},"content":[{"type":"text","text":"編寫 Redis 配置文件"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"　　"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"heading","attrs":{"align":null,"level":4},"content":[{"type":"text","text":"創建目錄及文件"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"　　"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"codeblock","attrs":{"lang":"shell"},"content":[{"type":"text","text":"# 創建目錄\nmkdir -p /usr/local/docker-redis/redis-cluster\n# 切換至指定目錄\ncd /usr/local/docker-redis/redis-cluster/\n# 編寫 redis-cluster.tmpl 文件\nvi redis-cluster.tmpl"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"　　"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"heading","attrs":{"align":null,"level":4},"content":[{"type":"text","text":"編寫配置文件"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"　　"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"　　"},{"type":"codeinline","content":[{"type":"text","text":"redis-cluster.tmpl"}]},{"type":"text","text":" 文件內容如下："}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"codeblock","attrs":{"lang":"tepl"},"content":[{"type":"text","text":"port ${PORT}\nrequirepass 1234\nmasterauth 1234\nprotected-mode no\ndaemonize no\nappendonly yes\ncluster-enabled yes\ncluster-config-file nodes.conf\ncluster-node-timeout 15000\ncluster-announce-ip 192.168.10.10\ncluster-announce-port ${PORT}\ncluster-announce-bus-port 1${PORT}"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"bulletedlist","content":[{"type":"listitem","content":[{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"codeinline","content":[{"type":"text","text":"port"}]},{"type":"text","text":"：節點端口；"}]}]},{"type":"listitem","content":[{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"codeinline","content":[{"type":"text","text":"requirepass"}]},{"type":"text","text":"：添加訪問認證；"}]}]},{"type":"listitem","content":[{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"codeinline","content":[{"type":"text","text":"masterauth"}]},{"type":"text","text":"：如果主節點開啓了訪問認證，從節點訪問主節點需要認證；"}]}]},{"type":"listitem","content":[{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"codeinline","content":[{"type":"text","text":"protected-mode"}]},{"type":"text","text":"：保護模式，默認值 yes，即開啓。開啓保護模式以後，需配置 "},{"type":"codeinline","content":[{"type":"text","text":"bind ip"}]},{"type":"text","text":" 或者設置訪問密碼；關閉保護模式，外部網絡可以直接訪問；"}]}]},{"type":"listitem","content":[{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"codeinline","content":[{"type":"text","text":"daemonize"}]},{"type":"text","text":"：是否以守護線程的方式啓動（後臺啓動），默認 no；"}]}]},{"type":"listitem","content":[{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"codeinline","content":[{"type":"text","text":"appendonly"}]},{"type":"text","text":"：是否開啓 AOF 持久化模式，默認 no；"}]}]},{"type":"listitem","content":[{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"codeinline","content":[{"type":"text","text":"cluster-enabled"}]},{"type":"text","text":"：是否開啓集羣模式，默認 no；"}]}]},{"type":"listitem","content":[{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"codeinline","content":[{"type":"text","text":"cluster-config-file"}]},{"type":"text","text":"：集羣節點信息文件；"}]}]},{"type":"listitem","content":[{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"codeinline","content":[{"type":"text","text":"cluster-node-timeout"}]},{"type":"text","text":"：集羣節點連接超時時間；"}]}]},{"type":"listitem","content":[{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"codeinline","content":[{"type":"text","text":"cluster-announce-ip"}]},{"type":"text","text":"：集羣節點 IP，這裏需要特別注意一下，如果要對外提供訪問功能，需要填寫宿主機的 IP，如果填寫 Docker 分配的 IP（172.x.x.x），可能會導致外部無法正常訪問集羣；"}]}]},{"type":"listitem","content":[{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"codeinline","content":[{"type":"text","text":"cluster-announce-port"}]},{"type":"text","text":"：集羣節點映射端口；"}]}]},{"type":"listitem","content":[{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"codeinline","content":[{"type":"text","text":"cluster-announce-bus-port"}]},{"type":"text","text":"：集羣節點總線端口。"}]}]}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"blockquote","content":[{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"　　每個 Redis 集羣節點都需要打開"},{"type":"text","marks":[{"type":"strong"}],"text":"兩個 TCP 連接"},{"type":"text","text":"。一個用於爲客戶端提供服務的正常 Redis TCP 端口，例如 6379。還有一個基於 6379 端口加 10000 的端口，比如 16379。"}]}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":">"}]},{"type":"blockquote","content":[{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"　　第二個端口用於集羣總線，這是一個使用二進制協議的節點到節點通信通道。節點使用集羣總線進行故障檢測、配置更新、故障轉移授權等等。客戶端永遠不要嘗試與集羣總線端口通信，與正常的 Redis 命令端口通信即可，但是請確保防火牆中的這兩個端口都已經打開，否則 Redis 集羣節點將無法通信。"}]}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"　　"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"　　在 "},{"type":"codeinline","content":[{"type":"text","text":"redis-cluster"}]},{"type":"text","text":" 目錄下執行以下命令："}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"codeblock","attrs":{"lang":"shell"},"content":[{"type":"text","text":"for port in `seq 6371 6376`; do \\\n mkdir -p ${port}/conf \\\n && PORT=${port} envsubst < redis-cluster.tmpl > ${port}/conf/redis.conf \\\n && mkdir -p ${port}/data;\\\ndone"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"blockquote","content":[{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"上面是一段 shell for 語句，意思就是循環創建 6371 ~ 6376 相關的目錄及文件。"}]}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"　　"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"　　查看命令執行結果，如果沒有 "},{"type":"codeinline","content":[{"type":"text","text":"tree"}]},{"type":"text","text":" 命令先安裝 "},{"type":"codeinline","content":[{"type":"text","text":"yum install -y tree"}]},{"type":"text","text":"。"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"image","attrs":{"src":"https://static001.geekbang.org/infoq/97/978a3123c8900202d23454c01c181c78.png","alt":null,"title":" ","style":null,"href":null,"fromPaste":true,"pastePass":true}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"　　"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"　　以下內容爲每個節點的配置文件詳細信息。"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"codeblock","attrs":{"lang":"shell"},"content":[{"type":"text","text":"[root@localhost redis-cluster]# cat /usr/local/docker-redis/redis-cluster/637{1..6}/conf/redis.conf\nport 6371\nrequirepass 1234\nmasterauth 1234\nprotected-mode no\ndaemonize no\nappendonly yes\ncluster-enabled yes\ncluster-config-file nodes.conf\ncluster-node-timeout 15000\ncluster-announce-ip 192.168.10.10\ncluster-announce-port 6371\ncluster-announce-bus-port 16371\n\nport 6372\nrequirepass 1234\nmasterauth 1234\nprotected-mode no\ndaemonize no\nappendonly yes\ncluster-enabled yes\ncluster-config-file nodes.conf\ncluster-node-timeout 15000\ncluster-announce-ip 192.168.10.10\ncluster-announce-port 6372\ncluster-announce-bus-port 16372\n\nport 6373\nrequirepass 1234\nmasterauth 1234\nprotected-mode no\ndaemonize no\nappendonly yes\ncluster-enabled yes\ncluster-config-file nodes.conf\ncluster-node-timeout 15000\ncluster-announce-ip 192.168.10.10\ncluster-announce-port 6373\ncluster-announce-bus-port 16373\n\nport 6374\nrequirepass 1234\nmasterauth 1234\nprotected-mode no\ndaemonize no\nappendonly yes\ncluster-enabled yes\ncluster-config-file nodes.conf\ncluster-node-timeout 15000\ncluster-announce-ip 192.168.10.10\ncluster-announce-port 6374\ncluster-announce-bus-port 16374\n\nport 6375\nrequirepass 1234\nmasterauth 1234\nprotected-mode no\ndaemonize no\nappendonly yes\ncluster-enabled yes\ncluster-config-file nodes.conf\ncluster-node-timeout 15000\ncluster-announce-ip 192.168.10.10\ncluster-announce-port 6375\ncluster-announce-bus-port 16375\n\nport 6376\nrequirepass 1234\nmasterauth 1234\nprotected-mode no\ndaemonize no\nappendonly yes\ncluster-enabled yes\ncluster-config-file nodes.conf\ncluster-node-timeout 15000\ncluster-announce-ip 192.168.10.10\ncluster-announce-port 6376\ncluster-announce-bus-port 16376"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"　　"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"heading","attrs":{"align":null,"level":3},"content":[{"type":"text","text":"創建 Redis 容器"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"　　"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"heading","attrs":{"align":null,"level":4},"content":[{"type":"text","text":"創建容器"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"　　"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"　　將宿主機的 "},{"type":"codeinline","content":[{"type":"text","text":"6371 ~ 6376"}]},{"type":"text","text":" 之間的端口與 6 個 Redis 容器映射，並將宿主機的目錄與容器內的目錄進行映射（目錄掛載）。記得指定網絡模式，使用我們自己創建的 "},{"type":"codeinline","content":[{"type":"text","text":"redis-net"}]},{"type":"text","text":" 網絡。"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"codeblock","attrs":{"lang":"shell"},"content":[{"type":"text","text":"for port in $(seq 6371 6376); do \\\n docker run -di -p ${port}:${port} -p 1${port}:1${port} \\\n --restart always --name redis-${port} --net redis-net \\\n -v /usr/local/docker-redis/redis-cluster/${port}/conf/redis.conf:/usr/local/etc/redis/redis.conf \\\n -v /usr/local/docker-redis/redis-cluster/${port}/data:/data \\\n redis redis-server /usr/local/etc/redis/redis.conf; \\\ndone"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"　　"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"　　"},{"type":"codeinline","content":[{"type":"text","text":"docker ps -n 6"}]},{"type":"text","text":" 查看容器是否創建成功。"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"image","attrs":{"src":"https://static001.geekbang.org/infoq/65/65c7a2d40776880113619b35f4aa88ca.png","alt":null,"title":" ","style":null,"href":null,"fromPaste":true,"pastePass":true}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"　　"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"　　"},{"type":"codeinline","content":[{"type":"text","text":"docker network inspect redis-net | grep -i -E \"name|ipv4address\""}]},{"type":"text","text":" 查看給每個節點分配的IP信息。"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"image","attrs":{"src":"https://static001.geekbang.org/infoq/56/569552c67696cbb8aab1fcf2a8314b7d.png","alt":null,"title":" ","style":null,"href":null,"fromPaste":true,"pastePass":true}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"　　"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"heading","attrs":{"align":null,"level":3},"content":[{"type":"text","text":"創建 Redis Cluster 集羣"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"　　"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"　　隨便進入一個容器節點，並進入 "},{"type":"codeinline","content":[{"type":"text","text":"/usr/local/bin/"}]},{"type":"text","text":" 目錄："}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"codeblock","attrs":{"lang":"shell"},"content":[{"type":"text","text":"# 進入容器\ndocker exec -it redis-6371 bash\n# 切換至指定目錄\ncd /usr/local/bin/"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"　　"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"　　接下來我們就可以通過以下命令實現 Redis Cluster 集羣的創建。"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"codeblock","attrs":{"lang":"shell"},"content":[{"type":"text","text":"redis-cli -a 1234 --cluster create 172.18.0.2:6371 172.18.0.3:6372 172.18.0.4:6373 172.18.0.5:6374 172.18.0.6:6375 172.18.0.7:6376 --cluster-replicas 1"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"　　"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"　　出現選擇提示信息，輸入 "},{"type":"text","marks":[{"type":"strong"}],"text":"yes"},{"type":"text","text":"，結果如下所示："}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"image","attrs":{"src":"https://static001.geekbang.org/infoq/84/844c6920f8100e01b1b0538f4edf27e0.png","alt":null,"title":" ","style":null,"href":null,"fromPaste":true,"pastePass":true}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"　　集羣創建成功如下："}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"image","attrs":{"src":"https://static001.geekbang.org/infoq/ce/cee8c8f5666ea3ca91706d46a48a04cd.png","alt":null,"title":" ","style":null,"href":null,"fromPaste":true,"pastePass":true}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"　　"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"　　以下內容是創建集羣時返回的詳細信息，也就是上兩幅圖中的所有內容。"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"codeblock","attrs":{"lang":"shell"},"content":[{"type":"text","text":"root@705a5ec95a2e:/usr/local/bin# redis-cli -a 1234 --cluster create 172.18.0.2:6371 172.18.0.3:6372 172.18.0.4:6373 172.18.0.5:6374 172.18.0.6:6375 172.18.0.7:6376 --cluster-replicas 1\nWarning: Using a password with '-a' or '-u' option on the command line interface may not be safe.\n>>> Performing hash slots allocation on 6 nodes...\nMaster[0] -> Slots 0 - 5460\nMaster[1] -> Slots 5461 - 10922\nMaster[2] -> Slots 10923 - 16383\nAdding replica 172.18.0.6:6375 to 172.18.0.2:6371\nAdding replica 172.18.0.7:6376 to 172.18.0.3:6372\nAdding replica 172.18.0.5:6374 to 172.18.0.4:6373\nM: 4dbede8f79c98a8cf63556387ce8c2a793d20089 172.18.0.2:6371\n slots:[0-5460] (5461 slots) master\nM: c2117d59666f20be5a29485b2e22753991a2dcb9 172.18.0.3:6372\n slots:[5461-10922] (5462 slots) master\nM: a5a8fdda426785c54a0e557b753ef571d22581a7 172.18.0.4:6373\n slots:[10923-16383] (5461 slots) master\nS: 4aca662dbc0d40498592c11c8dcb94b62c39b15c 172.18.0.5:6374\n replicates a5a8fdda426785c54a0e557b753ef571d22581a7\nS: 55fe2da8fe4fb1acdf950a6030a6304713eb613b 172.18.0.6:6375\n replicates 4dbede8f79c98a8cf63556387ce8c2a793d20089\nS: be84c1e8600986d5ebfbd2e18611dc4d1ace41a7 172.18.0.7:6376\n replicates c2117d59666f20be5a29485b2e22753991a2dcb9\nCan I set the above configuration? (type 'yes' to accept): yes\n>>> Nodes configuration updated\n>>> Assign a different config epoch to each node\n>>> Sending CLUSTER MEET messages to join the cluster\nWaiting for the cluster to join\n\n>>> Performing Cluster Check (using node 172.18.0.2:6371)\nM: 4dbede8f79c98a8cf63556387ce8c2a793d20089 172.18.0.2:6371\n slots:[0-5460] (5461 slots) master\n 1 additional replica(s)\nS: be84c1e8600986d5ebfbd2e18611dc4d1ace41a7 192.168.10.10:6376\n slots: (0 slots) slave\n replicates c2117d59666f20be5a29485b2e22753991a2dcb9\nM: c2117d59666f20be5a29485b2e22753991a2dcb9 192.168.10.10:6372\n slots:[5461-10922] (5462 slots) master\n 1 additional replica(s)\nM: a5a8fdda426785c54a0e557b753ef571d22581a7 192.168.10.10:6373\n slots:[10923-16383] (5461 slots) master\n 1 additional replica(s)\nS: 4aca662dbc0d40498592c11c8dcb94b62c39b15c 192.168.10.10:6374\n slots: (0 slots) slave\n replicates a5a8fdda426785c54a0e557b753ef571d22581a7\nS: 55fe2da8fe4fb1acdf950a6030a6304713eb613b 192.168.10.10:6375\n slots: (0 slots) slave\n replicates 4dbede8f79c98a8cf63556387ce8c2a793d20089\n[OK] All nodes agree about slots configuration.\n>>> Check for open slots...\n>>> Check slots coverage...\n[OK] All 16384 slots covered."}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"　　"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"　　至此一個高可用的 Redis Cluster 集羣搭建完成，如下圖所示，該集羣中包含 6 個 Redis 節點，3 主 3 從。三個主節點會分配槽，處理客戶端的命令請求，而從節點可用在主節點故障後，頂替主節點。"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"image","attrs":{"src":"https://static001.geekbang.org/infoq/27/27ad2d63da3a5939ff37f79c0baa3f49.png","alt":null,"title":" ","style":null,"href":null,"fromPaste":true,"pastePass":true}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"　　"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"heading","attrs":{"align":null,"level":2},"content":[{"type":"text","text":"查看集羣狀態"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"　　"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"　　我們先進入容器，然後通過一些集羣常用的命令查看一下集羣的狀態。"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"codeblock","attrs":{"lang":"shell"},"content":[{"type":"text","text":"# 進入容器\ndocker exec -it redis-6371 bash\n# 切換至指定目錄\ncd /usr/local/bin/"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"　　"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"heading","attrs":{"align":null,"level":3},"content":[{"type":"text","text":"檢查集羣狀態"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"　　"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"　　因爲我們使用了自定義的網絡進行容器管理，這樣可以使容器直接通過容器名稱通信。推薦使用這種方式。"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"codeblock","attrs":{"lang":"shell"},"content":[{"type":"text","text":"# 使用 IP\nredis-cli -a 1234 --cluster check 192.168.10.10:6371\n# 使用容器名稱\nredis-cli -a 1234 --cluster check redis-6372:6372"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"image","attrs":{"src":"https://static001.geekbang.org/infoq/94/94c31410b6a03bebd377a937321f28ef.png","alt":null,"title":" ","style":null,"href":null,"fromPaste":true,"pastePass":true}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"　　"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"heading","attrs":{"align":null,"level":3},"content":[{"type":"text","text":"查看集羣信息和節點信息"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"　　"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"codeblock","attrs":{"lang":"shell"},"content":[{"type":"text","text":"# 連接至集羣某個節點\nredis-cli -c -a 1234 -h redis-6373 -p 6373\n# 查看集羣信息\ncluster info\n# 查看集羣結點信息\ncluster nodes"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"image","attrs":{"src":"https://static001.geekbang.org/infoq/19/19fcfd1a639370243688dc338657b224.png","alt":null,"title":" ","style":null,"href":null,"fromPaste":true,"pastePass":true}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"　　"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"heading","attrs":{"align":null,"level":3},"content":[{"type":"text","text":"SET/GET"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"　　"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"　　在 6371 節點中執行寫入和讀取，命令如下："}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"codeblock","attrs":{"lang":"shell"},"content":[{"type":"text","text":"# 進入容器並連接至集羣某個節點\ndocker exec -it redis-6371 /usr/local/bin/redis-cli -c -a 1234 -h redis-6371 -p 6371\n# 寫入數據\nset name mrhelloworld\nset aaa 111\nset bbb 222\n# 讀取數據\nget name\nget aaa\nget bbb"}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"image","attrs":{"src":"https://static001.geekbang.org/infoq/5e/5e9bc4e5e6a918637c6a0bcc2cb34fac.png","alt":null,"title":" ","style":null,"href":null,"fromPaste":true,"pastePass":true}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"　　彆着急，讓我來解釋一下上圖中的操作過程："}]},{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"bulletedlist","content":[{"type":"listitem","content":[{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"首先進入容器並連接至集羣某個節點；"}]}]},{"type":"listitem","content":[{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"然後執行"},{"type":"text","marks":[{"type":"strong"}],"text":"第一個"},{"type":"text","text":" set 命令 "},{"type":"codeinline","content":[{"type":"text","text":"set name mrhelloworld"}]},{"type":"text","text":"，"},{"type":"codeinline","content":[{"type":"text","text":"name"}]},{"type":"text","text":" 鍵根據哈希函數運算以後得到的值爲 "},{"type":"codeinline","content":[{"type":"text","text":"[5798]"}]},{"type":"text","text":"。當前集羣環境的槽分配情況爲："},{"type":"codeinline","content":[{"type":"text","text":"[0-5460] 6371節點"}]},{"type":"text","text":"，"},{"type":"codeinline","content":[{"type":"text","text":"[5461-10922] 6372節點"}]},{"type":"text","text":"，"},{"type":"codeinline","content":[{"type":"text","text":"[10923-16383] 6373節點"}]},{"type":"text","text":"，所以該鍵的存儲就被分配到了 "},{"type":"text","marks":[{"type":"strong"}],"text":"6372"},{"type":"text","text":" 節點上；"}]}]},{"type":"listitem","content":[{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"再來看"},{"type":"text","marks":[{"type":"strong"}],"text":"第二個"},{"type":"text","text":" set 命令 "},{"type":"codeinline","content":[{"type":"text","text":"set aaa"}]},{"type":"text","text":"，這裏大家可能會有一些疑問，爲什麼看不到 "},{"type":"codeinline","content":[{"type":"text","text":"aaa"}]},{"type":"text","text":" 鍵根據哈希函數運算以後得到的值？因爲剛纔重定向至 "},{"type":"text","marks":[{"type":"strong"}],"text":"6372"},{"type":"text","text":" 節點插入了數據，此時如果還有數據插入，正好鍵根據哈希函數運算以後得到的值也還在該節點的範圍內，那麼直接插入數據即可；"}]}]},{"type":"listitem","content":[{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"接着是"},{"type":"text","marks":[{"type":"strong"}],"text":"第三個"},{"type":"text","text":" set 命令 "},{"type":"codeinline","content":[{"type":"text","text":"set bbb"}]},{"type":"text","text":"，"},{"type":"codeinline","content":[{"type":"text","text":"bbb"}]},{"type":"text","text":" 鍵根據哈希函數運算以後得到的值爲 "},{"type":"codeinline","content":[{"type":"text","text":"[5287]"}]},{"type":"text","text":"，所以該鍵的存儲就被分配到了 "},{"type":"text","marks":[{"type":"strong"}],"text":"6371"},{"type":"text","text":" 節點上；"}]}]},{"type":"listitem","content":[{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","text":"然後是讀取操作，"},{"type":"text","marks":[{"type":"strong"}],"text":"第四個"},{"type":"text","text":"命令 "},{"type":"codeinline","content":[{"type":"text","text":"get name"}]},{"type":"text","text":"，"},{"type":"codeinline","content":[{"type":"text","text":"name"}]},{"type":"text","text":" 鍵根據哈希函數運算以後得到的值爲 "},{"type":"codeinline","content":[{"type":"text","text":"[5798]"}]},{"type":"text","text":"，被重定向至 "},{"type":"text","marks":[{"type":"strong"}],"text":"6372"},{"type":"text","text":" 節點讀取；"}]}]},{"type":"listitem","content":[{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null},"content":[{"type":"text","marks":[{"type":"strong"}],"text":"第五個"},{"type":"text","text":"命令 "},{"type":"codeinline","content":[{"type":"text","text":"get 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