ZooKeeper是一個分佈式開源框架,提供了協調分佈式應用的基本服務,它向外部應用暴露一組通用服務——分佈式同步(Distributed Synchronization).命名服務(Naming Service).集羣維護(Group Maintenance)等,簡化分佈式應用協調及其管理的難度,提供高性能的分佈式服務。ZooKeeper本身可以以Standalone模式安裝運行,不過它的長處在於通過分佈式ZooKeeper集羣(一個Leader,多個Follower),基於一定的策略來保證ZooKeeper集羣的穩定性和可用性,從而實現分佈式應用的可靠性。(獲取【下載地址】 )
這裏先講解一下單節點安裝(後期會提供集羣安裝模式),由於直接進行操作,故下面記錄詳細步驟:
ZooKeeper Standalone模式
1.修改操作系統的/etc/hosts 文件中添加
# zookeeper servers (主機IP jeesz-provider-01)
[root@cloud ~]# vi /etc/hosts
xxx.xxx.xxx.xxx jeesz-provider-01
2.到 http://apache.fayea.com/zookeeper/下載 zookeeper-3.4.6
[root@cloud ~]# wget http://apache.fayea.com/zookeeper/zookeeper-3.4.6/zookeeper-3.4.6.tar.gz
由於我提前下載了並上傳到了我指定的目錄:/home/jeesz
3. 解壓 zookeeper 安裝包
[root@cloud jeesz] tar -zxvf zookeeper-3.4.6.tar.gz
4. 在/home/jeesz/zookeeper-3.4.6 目錄下創建以下目錄
[root@cloud ~]# cd /home/jeesz/zookeeper-3.4.6
[root@cloud zookeeper-3.4.6]# mkdir data
[root@cloud zookeeper-3.4.6]# mkdir logs
5.將 zookeeper-3.4.6/conf 目錄下的 zoo_sample.cfg 文件拷貝一份,命名爲爲zoo.cfg
[root@cloud conf]# cp zoo_sample.cfg zoo.cfg
6.修改 zoo.cfg 配置文件
[root@cloud conf]# vi zoo.cfg
# The number of milliseconds of each tick
tickTime=2000
# The number of ticks that the initial
# synchronization phase can take
initLimit=10
# The number of ticks that can pass between
# sending a request and getting an acknowledgement
syncLimit=5
# the directory where the snapshot is stored.
# do not use /tmp for storage, /tmp here is just
# example sakes.
dataDir=/home/jeesz/zookeeper-3.4.6/data
dataLogDir=/home/jeesz/zookeeper-3.4.6/logs
# the port at which the clients will connect
clientPort=2181
#2888,3888 are election port
server.1=jeesz-provider-01:2888:3888
7.在/home/jeesz/zookeeper-3.4.6/data 下創建 myid 文件
編輯 myid 文件,並在對應的 IP 的機器上輸入對應的編號。如在 zookeeper 上,myid
文件內容就是 1。如果只在單點上進行安裝配置,那麼只有一個 server.1。
[root@cloud data]# vi myid
1
8.jeesz 用戶下修改 vi /home/jeesz/.bash_profile,增加 zookeeper 配置
[root@cloud ~] vi /home/jeesz/.bash_profile
# zookeeper env
export ZOOKEEPER_HOME=/home/jeesz/zookeeper-3.4.6
export PATH=$ZOOKEEPER_HOME/bin:$PATH
使配置文件生效
[root@cloud ~]# source /home/jeesz/.bash_profile
9.在防火牆中打開要用到的端口 2181.2888.3888
切換到 root 用戶權限,執行以下命令:
[root@cloud ~]# chkconfig iptables on
[root@cloud ~]# service iptables start
編輯/etc/sysconfig/iptables
[root@cloud ~]# vi /etc/sysconfig/iptables
增加以下 3 行:
-A INPUT -m state --state NEW -m tcp -p tcp --dport 2181 -j ACCEPT
-A INPUT -m state --state NEW -m tcp -p tcp --dport 2888 -j ACCEPT
-A INPUT -m state --state NEW -m tcp -p tcp --dport 3888 -j ACCEPT
重啓防火牆:
[root@cloud ~] service iptables restart
查看防火牆端口狀態:
[root@cloud]# service iptables status
Table: filter
Chain INPUT (policy ACCEPT)
num target prot opt source destination
1 ACCEPT all -- 0.0.0.0/0 0.0.0.0/0 state RELATED,ESTABLISHED
2 ACCEPT icmp -- 0.0.0.0/0 0.0.0.0/0
3 ACCEPT all -- 0.0.0.0/0 0.0.0.0/0
4 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:22
5 REJECT all -- 0.0.0.0/0 0.0.0.0/0 reject-with icmp-host-prohibited
6 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:8080
7 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:2181
8 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:2888
9 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 state NEW tcp dpt:3888
Chain FORWARD (policy ACCEPT)
num target prot opt source destination
1 REJECT all -- 0.0.0.0/0 0.0.0.0/0 reject-with icmp-host-prohibited
Chain OUTPUT (policy ACCEPT)
num target prot opt source destination
10.啓動並測試 zookeeper
(1) 到/home/jeesz/zookeeper-3.4.6/bin 目錄中執行:
[root@cloud bin]# zkServer.sh start
(2) 輸入 jps 命令查看進程:
[root@cloud zookeeper-3.4.6]# jps
48064 Jps
47348 QuorumPeerMain
46826 Bootstrap
其中,QuorumPeerMain 是 zookeeper 進程,啓動正常
(3) 查看狀態:
[root@cloud bin]# zkServer.sh status
JMX enabled by default
Using config: /home/jeesz/zookeeper-3.4.6/bin/../conf/zoo.cfg
Mode: standalone
(4) 查看 zookeeper 服務輸出信息:
由於服務信息輸出文件在/home/jeesz/zookeeper-3.4.6/bin/zookeeper.out
[root@cloud bin]# tail -f zookeeper.out
2016-02-16 02:20:14,500 [myid:] - INFO [main:QuorumPeerConfig@103] - Reading configuration from: /home/jeesz/zookeeper-3.4.6/bin/../conf/zoo.cfg
2016-02-16 02:20:14,700 [myid:] - ERROR [main:QuorumPeerConfig@289] - Invalid configuration, only one server specified (ignoring)
......
11.停止 zookeeper 進程
[root@cloud bin]# zkServer.sh stop
12.配置 zookeeper 開機使用 jeesz 用戶啓動
編輯/etc/rc.local 文件,加入:
[root@cloud bin]# vi /etc/rc.local
su - jeesz -c '/home/jeesz/zookeeper-3.4.6/bin/zkServer.sh start'