monit

man: Monit - utility for monitoring services on a Unix system
Configuration Examples

monit 的默认配置可能未开启 HTTP 服务, 但 monit 自身是依赖该服务的, 未开启会导致: error connecting to the monit daemon. 需修改配置开启 HTTP 服务

只允许本地连接

set httpd port 2812 and
   use address localhost  # only accept connection from localhost
   allow localhost        # allow localhost to connect to the server and

允许远程用 HTTP AUTH 连接

set httpd port 2812
   allow admin:monit      # require user 'admin' with password 'monit'

让 monit 开启后延迟启动, 以防与被 monitor 的进程在启动上冲突

set daemon 120            # check services at 2-minute intervals
  with start delay 240    # optional: delay the first check by 4-minutes (by
                          # default Monit check immediately after Monit start)

限制进程的内存使用, 过量后重启

check process foo with pidfile "/var/run/foo.pid"
    start program = "/sbin/start foo"
    stop program  = "/sbin/stop foo"
    if mem > 30 MB then restart

monit (~5.4 据我所知) 是不能在一条 check 中 ''check 多 matching “foo*” 或 “/var/run/foo*.pid” 的进程的. 如若想让符合某 pattern 的各进程在 mem 超标时 kill, 可如下 cron:

/etc/kill_over_mem_foo_procs.sh

#!/bin/bash
 
# /etc/cron.d/foo
# */5 * * * * root /etc/kill_over_mem_foo_procs.sh
 
# 遍历 foo 的 pid 和 memory(RSS),
# 若 memory 使用超过 mem_limit, 则 kill pid.
# 由于 scripts 是 forever 挂起的, 所以稍后会重启.
# (Xiaopei Li@2013-12-31)
 
# 设内存使用上限为 18M
mem_limit=18000
 
ps aux | grep -F 'foo'  | grep -v grep | awk '{print $2, $6}' | \
while read pid mem; do
  if [[ $mem > $mem_limit ]]; then
    kill $pid
  fi
done

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