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背景说明
最近监控到新安装的es集群的head服务经常挂掉，导致http://ip:9100 UI页面打不开。
检查了es集群没有问题，却发现启动head的npm grunt服务异常挂掉（es高版本后，默认使用npm的grunt服务启动web服务），查询了下日志暂未发现任何问题，于是打算写一个grunt服务异常故障重启shell脚本临时过渡一下。
相关代码
es_head_self_restart.sh
#!/bin/sh
# Author: angelfish
# Desc: a daemon program for pull and restart the downed ES-HEAD plugin.
curr_time=$(date "+%Y-%m-%d %H:%M:%S")
start_command='/usr/local/elasticsearch-head/node_modules/grunt/bin/grunt server &'
while :
echo '>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> Current time is: '$curr_time
do
curr_time=$(date "+%Y-%m-%d %H:%M:%S")
echo ">> Current path is: " $PWD
runningStatus=$(ps -ef|grep "grunt"|grep -v "grep")
if [ "$runningStatus" ]; then
echo "Npm grunt server for es-head plugin was already started"
echo "here we do nothing"
echo '************************* $runningStatus : '$runningStatus
else
echo "Detected that grunt server was down, will attempt start it again."
#$start_command
/usr/local/elasticsearch-head/node_modules/grunt/bin/grunt server &
fi
sleep 30
done
grep + awk相关获取任务进程号方法
[es_deployman@balabala-50 elasticsearch-head]$ ps -ef|grep grunt|grep -v grep|awk -F ‘\s+’ ‘{print $0}’
es_depl+ 12954 12946 0 12:04 pts/0 00:00:01 grunt
[es_deployman@balabala-50 elasticsearch-head]$ ps -ef|grep grunt|grep -v grep|awk -F ‘\s+’ ‘{print $1}’
es_depl+
[es_deployman@balabala-50 elasticsearch-head]$ ps -ef|grep grunt|grep -v grep|awk -F ‘\s+’ ‘{print $2}’
12954
一些想法
关于启动方式：
1、可以以nohup方式启动该daemon脚本，如下：nohup es_head_self_restart.sh >> es_head_self_restart.sh.out &
2、crontab方式方式启动定期检查状态，这时可将shell 脚本里的sleep 语句去掉；