Redis 集羣安裝
集羣搭建步驟
1、創建多個節點.
2、爲每個節點指派槽，並將多個節點連接起來，組成一個集羣.
3、當集羣數據庫的16384個槽都有節點在處理時，集羣進入上線狀態.
要求：搭建一個包含6個節點的Redis集羣，其中三個主節點，三個從節點，每個主節點都有一個從節點
注：在極端情況下，如果將16384個槽都指派給一個主節點，那麼只有一個主節點也可以讓集羣進入上線狀態，但是要讓集羣的故障轉移特性生效，最起碼要有3個主節點，而要讓故障轉移真正有意義，至少要爲三個主節點分別設置一個從節點，這也是本例子中使用6個節點的原因。
1. 下載安裝:
redis install :
a) Wget http://download.redis.io/releases/redis-3.0.2.tar.gz
b) Tar xzvf redis-3.0.2.tar.gz
c) Make
d) Make install
ruby install:
a)yum install ruby
b)yum install rubygems
c)gem install -l redis-3.0.0.gem
2. 搭建集羣:
爲了讓Redis服務器以集羣模式運行，我們需要在啓動服務器時，打開服務器的集羣模式選項：
cluster-enabled yes
另外，如果有多個節點運行在同一臺集羣上，那麼我們還需要爲每個節點指定一個不同的端口號
port 7000
將如上的兩個配置值寫入redis.conf文件中，然後執行如下命令來啓動一個Redis節點
redis-server redis.conf
redis.conf配置文件如下：
daemonize no tcp-backlog 511 timeout 0 tcp-keepalive 0 loglevel notice databases 32 save 900 1 save 300 10 save 60 10000 stop-writes-on-bgsave-error yes rdbcompression yes rdbchecksum yes dir "/usr/local/redis/var" slave-serve-stale-data yes slave-read-only yes repl-diskless-sync no repl-diskless-sync-delay 5 repl-disable-tcp-nodelay no slave-priority 100 appendonly no appendfsync everysec no-appendfsync-on-rewrite no auto-aof-rewrite-percentage 100 auto-aof-rewrite-min-size 64mb aof-load-truncated yes lua-time-limit 5000 slowlog-log-slower-than 10000 slowlog-max-len 128 latency-monitor-threshold 0 notify-keyspace-events "" hash-max-ziplist-entries 512 hash-max-ziplist-value 64 list-max-ziplist-entries 512 list-max-ziplist-value 64 set-max-intset-entries 512 zset-max-ziplist-entries 128 zset-max-ziplist-value 64 hll-sparse-max-bytes 3000 activerehashing yes client-output-buffer-limit normal 0 0 0 client-output-buffer-limit slave 256mb 64mb 60 client-output-buffer-limit pubsub 32mb 8mb 60 hz 10 aof-rewrite-incremental-fsync yes #打開redis集羣 cluster-enabled yes #節點互連超時的閥值 cluster-node-timeout 15000 cluster-migration-barrier 1 #cluster配置文件 cluster-config-file /usr/local/redis/var/nodes-7000.conf #不同端口設置 pidfile /var/run/redis_7000.pid port 7000 logfile "/var/log/redis_7000.log" dbfilename dump-7000.rdb appendfilename "appendonly-7000.aof" |
a) 準備redis.conf ,使用以下腳本.
#!/bin/bash
FilePath="/etc/redis_cluster"
mkdir -p $FilePath
for i in `seq -w 0 5`
do
cp redis.conf $FilePath/700$i.conf
sed -i "s#port 7000#port 700$i#g" $FilePath/700$i.conf
sed -i "s#pidfile /var/run/redis_7000.pid#pidfile /var/run/redis_700$i.pid/g" $FilePath/700$i.conf
sed -i "s#logfile \"/var/log/redis_7000.log\"#logfile \"/var/log/redis_700$i.log/g\" $FilePath/700$i.conf
sed -i "s#cluster-config-file /usr/local/redis/var/nodes-7000.conf#cluster-config-file /usr/local/redis/var/nodes-700$i.conf/g" $FilePath/700$i.conf
sed -i "s#dbfilename dump-7000.rdb#dbfilename dump-700$i.rdb#g" $FilePath/700$i.conf
sed -i "s#appendfilename \"appendonly-7000.aof\"#appendfilename \"appendonly-700$i.aof\"#g" $FilePath/700$i.conf
Done
b) 啓動 redis 節點
#!/bin/bash
FilePath="/etc/redis_cluster"
for i in `seq -w 0 5`;do
redis-server $FilePath/700$i.conf
done
c) 判斷各個節點的Redis服務是否啓動成功：
d) 創建Redis Cluster
[root@linux6_TEST src]# ./redis-trib.rb create --replicas 1 127.0.0.1:7000 127.0.0.1:7001 127.0.0.1:7002 127.0.0.1:7003 127.0.0.1:7004 127.0.0.1:7005
>>> Creating cluster
Connecting to node 127.0.0.1:7000: OK
Connecting to node 127.0.0.1:7001: OK
Connecting to node 127.0.0.1:7002: OK
Connecting to node 127.0.0.1:7003: OK
Connecting to node 127.0.0.1:7004: OK
Connecting to node 127.0.0.1:7005: OK
>>> Performing hash slots allocation on 6 nodes...
Using 3 masters:
127.0.0.1:7000
127.0.0.1:7001
127.0.0.1:7002
Adding replica 127.0.0.1:7003 to 127.0.0.1:7000
Adding replica 127.0.0.1:7004 to 127.0.0.1:7001
Adding replica 127.0.0.1:7005 to 127.0.0.1:7002
M: 8bd14c65c633af4ddc52a8c254f4ae16ecc1445d 127.0.0.1:7000
slots:0-5460 (5461 slots) master
M: a39f2fb7b03f3cb95bfefb52a40003f5d3514b94 127.0.0.1:7001
slots:5461-10922 (5462 slots) master
M: e2683986eb936f09265059b24422d23e97123467 127.0.0.1:7002
slots:10923-16383 (5461 slots) master
S: 446fbf7cabb22d920478f17490af8bf938ed27a3 127.0.0.1:7003
replicates 8bd14c65c633af4ddc52a8c254f4ae16ecc1445d
S: 4f8a7495220047080f557e64f1a5f1ef2e34c13d 127.0.0.1:7004
replicates a39f2fb7b03f3cb95bfefb52a40003f5d3514b94
S: 595c7b7971059cb204c28a5df729e5c7b3e39346 127.0.0.1:7005
replicates e2683986eb936f09265059b24422d23e97123467
Can I set the above configuration? (type 'yes' to accept): yes
>>> Nodes configuration updated
>>> Assign a different config epoch to each node
>>> Sending CLUSTER MEET messages to join the cluster
Waiting for the cluster to join..
>>> Performing Cluster Check (using node 127.0.0.1:7000)
M: 8bd14c65c633af4ddc52a8c254f4ae16ecc1445d 127.0.0.1:7000
slots:0-5460 (5461 slots) master
M: a39f2fb7b03f3cb95bfefb52a40003f5d3514b94 127.0.0.1:7001
slots:5461-10922 (5462 slots) master
M: e2683986eb936f09265059b24422d23e97123467 127.0.0.1:7002
slots:10923-16383 (5461 slots) master
M: 446fbf7cabb22d920478f17490af8bf938ed27a3 127.0.0.1:7003
slots: (0 slots) master
replicates 8bd14c65c633af4ddc52a8c254f4ae16ecc1445d
M: 4f8a7495220047080f557e64f1a5f1ef2e34c13d 127.0.0.1:7004
slots: (0 slots) master
replicates a39f2fb7b03f3cb95bfefb52a40003f5d3514b94
M: 595c7b7971059cb204c28a5df729e5c7b3e39346 127.0.0.1:7005
slots: (0 slots) master
replicates e2683986eb936f09265059b24422d23e97123467
[OK] All nodes agree about slots configuration.
>>> Check for open slots...
>>> Check slots coverage...
[OK] All 16384 slots covered.
###如果整個集羣數據庫的16384個槽都有節點在處理，那麼集羣就會進入上線狀態，之後用戶就可以開始向集羣發送命令請求了
集羣訪問
使用集羣客戶端向集羣發送命令請求
目前主要的 Redis 集羣客戶端（或者說，支持集羣功能的 Redis 客戶端）有以下這些：
1、redis-rb-cluster：antirez 使用 Ruby 編寫的 Redis 集羣客戶端，集羣客戶端的官方實現；
2、predis：Redis 的 PHP 客戶端，支持集羣功能；
3、jedis：Redis 的 JAVA 客戶端，支持集羣功能；
4、StackExchange.Redis：Redis 的 C# 客戶端，支持集羣功能；
5、內置的 redis-cli ：在啓動時給定 -c 參數即可進入集羣模式，支持部分集羣功能；
數據備份:
注意備份每個實例的 dump.rdb 和 cluster 配置文件 cluster-config-file