ZooKeeper 节点镜像制作

安装 agent
下载青云提供的 app agent Linux 版本, Windows 版本，解压后运行 ./install.sh (Windows 下双击 install.bat)
安装 ZooKeepr
下载 ZooKeeper，解压安装至 /opt/zookeeper。安装 Java (以 Ubuntu 为例)
```
apt-get install openjdk-7-jre-headless
```

创建 toml 文件

创建 /etc/confd/conf.d/zoo.cfg.toml

  [template]
  src = "zoo.cfg.tmpl"
  dest = "/opt/zookeeper/conf/zoo.cfg"
  keys = [
      "/",
  ]
  reload_cmd = "/opt/zookeeper/bin/restart-server.sh"

创建 /etc/confd/conf.d/myid.toml

  [template]
  src = "myid.tmpl"
  dest = "/data/zookeeper/myid"
  keys = [
      "/",
  ]

创建 tmpl 文件

创建 /etc/confd/templates/zoo.cfg.tmpl

  {% raw %}
      tickTime=2000
      initLimit=10
      syncLimit=5
      dataDir=/data/zookeeper
      {{if exists "/cluster/endpoints/client/port"}}{{$port := getv "/cluster/endpoints/client/port"}}
      clientPort={{$port}}{{else}}clientPort=2181{{end}}
      maxClientCnxns=1000
      {{range $dir := lsdir "/hosts"}}{{$sid := printf "/hosts/%s/sid" $dir}}
      {{$ip := printf "/hosts/%s/ip" $dir}}server.{{getv $sid}}={{getv $ip}}:2888:3888{{end}}
  {% endraw %}

创建 /etc/confd/templates/myid.tmpl

{% raw %}
      {{getv "/host/sid"}}
{% endraw %}

ZooKeeper 相关改动

补充脚本，创建 /opt/zookeeper/bin/restart-server.sh

#! /bin/bash

# Restart zk server
/opt/zookeeper/bin/zkServer.sh restart

sleep 3

i=0

while [ $i -lt 10 ]
do
  /opt/zookeeper/bin/zkServer.sh status
  if [ $? -eq 0 ]; then
      echo "Restart zk server successful" > /var/log/zookeeper.log 2>&1
      exit 0
  else
      echo "zk server is not running" > /var/log/zookeeper.log 2>&1
      /opt/zookeeper/bin/zkServer.sh restart
  fi

  sleep 3
  i=$[$i+1]
done

echo "Failed to restart zk server" > /var/log/zookeeper.log 2>&1
exit 1

补充环境变量，创建 /opt/zookeeper/conf/java.env

#!/usr/bin/env bash
free=`grep MemFree /proc/meminfo | awk '{print $2}'`
buffer=`grep Buffers /proc/meminfo | awk '{print $2}'`
cache=`grep ^Cached /proc/meminfo | awk '{print $2}'`
freemem=`expr $free + $buffer + $cache`
total_free=`expr $freemem / 1024 - 90`
if [ $total_free -le 0 ]
then
total_free=20
fi

export JVMFLAGS="-Xmx${total_free}m"

更新日志路径，修改文件 /opt/zookeeper/bin/zkEnv.sh，把默认路径修改成如下路径：
```
ZOO_LOG_DIR＝"/data/zookeeper/logs"
```

ZooKeeper

ZooKeeper 节点镜像制作

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