Redis Standalone master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)。

创建 /etc/confd/conf.d/redis.conf.toml

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

创建 /etc/confd/templates/redis.conf.tmpl

      {% raw %}
    aof-rewrite-incremental-fsync yes
      appendfilename appendonly.aof
      auto-aof-rewrite-percentage 10
      auto-aof-rewrite-min-size 64mb
      bind 0.0.0.0
      client-output-buffer-limit normal 0 0 0
      client-output-buffer-limit pubsub 32mb 8mb 60
      client-output-buffer-limit slave 256mb 64mb 60
      daemonize yes
      databases 16
      dbfilename dump.rdb
      dir /data/redis
      hll-sparse-max-bytes 3000
      hz 10
      logfile /data/redis/logs/redis-server.log
      loglevel notice
      lua-time-limit 5000
      pidfile /var/run/redis/redis-server.pid
      repl-disable-tcp-nodelay no  
      rdbchecksum yes
      rdbcompression yes
      save ""
      slave-priority 0
      slave-read-only yes
      slave-serve-stale-data yes
      slowlog-max-len 128
      stop-writes-on-bgsave-error yes
      tcp-backlog 511
      {{range gets "/env/*"}}{{$v := .Value}}{{ if gt ( len ( $v ) ) 0 }}{{base .Key}} {{.Value}}
      {{ else }}{{base .Key}} ""
      {{end}}{{end}}
      {% endraw %}

最后 range 部分是 confd (已通过前面安装 agent 的方式部署到镜像里)这个服务读取青云提供的 metadata 服务来更新应用的配置，后面的路径表示这个节点本身所在集群或自身的所有信息，/env 即表示获取本节点的应用参数配置，获取某个 key 的值需要在 toml 模版文件里监听相应的 key，为简单起见，监听根节点/即可。 if/else 是因为 Redis 对空的值需要用引号引起来。
关于 confd 请参见 confd quick start guide 模版文件语法参见 templatestemplates

补充脚本
在此例中有两个脚本 stop-redis-server.sh (应用模版中定义的 stop service) 和 restart-redis-server.sh，Redis 官方并没有提供这些脚本，所以需要自己完善，示范如下。

创建 /opt/redis/bin/stop-redis-server.sh

  #! /bin/bash
  #
  # Copyright (C) 2015 Yunify Inc.
  #
  # Script to stop redis-server.

  PID=$(pidof redis-server)
  if [ -z "$PID" ]; then
      echo "redis-server is not running" > /var/log/redis.log 2>&1
      exit 0
  fi

  # Try to terminate redis-server
  kill -SIGTERM $PID

  # Check if redis-server is terminated
  for i in $(seq 0 2); do
     if ! ps -ef | grep ^stop-redis-server > /dev/null; then
         echo "redis-server is successfully terminated" >> /var/log/redis.log 2>&1
         exit 0
     fi
     sleep 1
  done

  # Not terminated yet, now I am being rude!
  # In case of a new redis-server process is somebody else (unlikely though),
  # we get the pid again here.
  kill -9 $(pidof redis-server)
  if [ $? -eq 0 ]; then
      echo "redis-server is successfully killed" >> /var/log/redis.log 2>&1
      exit 0
  else
      echo "Failed to kill redis-server" >> /var/log/redis.log 2>&1
      exit 1
  fi

创建 /opt/redis/bin/restart-redis-server.sh

  #! /bin/bash

  PID=$(pidof redis-server)
  if [ -z "$PID" ]; then
      echo "redis-server is not running"
      exit 0
  fi

  # Stop redis server
  /opt/redis/bin/stop-redis-server.sh

  # Start redis server
  if [ $? -eq 0 ]; then
      /opt/redis/bin/redis-server /opt/redis/redis.conf
      if [ $? -eq 0 ]; then
          echo "Restart redis-server successful"
          exit 0
      else
          echo "Failed to restart redis-server" 1>&2
          exit 1
      fi
  else
      echo "Failed to kill redis-server" 1>&2
      exit 1
  fi

主节点

Redis Standalone master节点镜像制作

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