一、下载并安装Monit
cd ~/Downloads
wget https://mmonit.com/monit/dist/monit-5.20.0.tar.gz
tar -zxvf monit-5.20.0.tar.gz
cd monit-5.20.0
./configure --without-pam --without-ssl
make
make install
二、配置Monit
1.复制配置文件并设置权限
首先，需要把Monit源码目录下的配置文件monitrc复制到/etc目录下并修改访问权限，切换到root用户，执行如下命令：
cp -f monitrc /etc/monitrc
chown root:root /etc/monitrc
chmod 0700 /etc/monitrc
2.修改配置文件的内容
使用命令vim /etc/monitrc修改/etc/monitrc配置文件的内容
2-1.修改Monit的检查周期
找到"set daemon 30" 一行，修改检查周期，默认为30秒，可以根据需要进行调整
2-2.修改http服务相关的配置
找到"set httpd port 2812 and" 一行，修改http服务相关的配置，原内容如下：
set httpd port 2812 and
use address localhost # only accept connection from localhost
allow localhost # allow localhost to connect to the server and
allow admin:monit # require user 'admin' with password 'monit'
第一行的2812是端口号，第2行的localhost是访问ip，第3行的localhost表示只允许本机访问，第4行的用户名和密码分别为admin和monit
为了可以远程进行访问，可以把第2行的访问IP localhost改为主机的IP地址，第3行的localhost改为0.0.0.0/0.0.0.0以允许任何主机访问。也可以修改用户名和密码。
修改后如下所示：
set httpd port 2812 and
use address 192.168.175.11 # only accept connection from localhost
allow 0.0.0.0/0.0.0.0 # allow localhost to connect to the server and
allow admin:monit # require user 'admin' with password 'monit'
2-3.添加对Storm主机的监控
在montric配置文件中添加如下配置：
check host node11 with address 192.168.175.11
if failed icmp type echo count 3 with timeout 3 seconds then alert
注意：如果Storm和Monit安装在同一台服务器上，则check host后不能写本机的主机名，否则会报错!!!
2-4.添加对Storm进程的监控
在montric配置文件中添加如下配置：
check program storm-nimbus with path "/opt/storm/storm-nimbus-exist.sh"
start program = "/opt/storm/storm-nimbus-start.sh"
stop program = "/opt/storm/storm-nimbus-stop.sh"
if status = 0 then restart
if 3 restarts within 5 cycles then alert
storm-nimbus-exist.sh文件的内容如下：
cmd=`/opt/storm/storm-deamon-exist.sh nimbus`
id=$cmd
echo $id
exit $id
storm-deamon-exist.sh文件内容如下：
process=$1
id=0
if [ $# -ge 1 ] && [ -n $process ] ; then
cmd=`jps | grep "$process" | awk '{print $1}'`
if [ -n "$cmd" ]; then
id=1
fi
fi
echo $id
storm-nimbus-start.sh文件的内容如下：
cmd=`/opt/storm/storm-deamon-start.sh nimbus`
$cmd
storm-deamon-start.sh文件的内容如下：
if [ $# -ge 1 ] && [ -n $1 ] ; then
nohup storm $1 > $STORM_HOME/logs/nohup.out 2>&1 &
echo "start java process [$1]"
fi
storm-nimbus-stop.sh文件的内容如下：
cmd=`/opt/storm/storm-deamon-stop.sh nimbus`
$cmd
storm-deamon-stop.sh文件的内容如下：
if [ $# -ge 1 ] && [ -n $1] ; then
kill -s 9 `jps | grep "$1" | awk '{print $1}'`
echo "java process [$1] killed."
fi
三、启动Monit
#检测monitrc文件的语法是否正确
monit -t正确会输出如下信息：
New Monit id: f9b0a61c9cb9ced6a65d56324f4d61c5
Stored in '/root/.monit.id'
Control file syntax OK
#启动Monit守护进程
monit
Starting Monit 5.20.0 daemon with http interface at [192.168.175.11]:2812
#检测是否启动成功
ps -ef | grep monit
root 10069 1 0 11:01 ? 00:00:00 monit
root 10076 2013 0 11:02 pts/0 00:00:00 grep monit
启动Monit的所有服务
monit restart all#查看Monit的所有服务的状态信息
monit status
所有配置和启动都正确的情况下会输出如下信息：
Monit 5.20.0 uptime: 8m
Remote Host 'node11'
status Online with all services
monitoring status Monitored
monitoring mode active
on reboot start
ping response time 0.016 ms
data collected Mon, 08 Apr 2019 11:36:19
Program 'storm-nimbus'
status Status ok
monitoring status Monitored
monitoring mode active
on reboot start
last exit value 1
last output 1
data collected Mon, 08 Apr 2019 11:36:19
System 'liuyazhuang11'
status Running
monitoring status Monitored
monitoring mode active
on reboot start
load average [0.21] [0.35] [0.29]
cpu 0.6%us 0.5%sy 0.0%wa
memory usage 858.7 MB [22.5%]
swap usage 0 B [0.0%]
uptime 2h 36m
boot time Mon, 08 Apr 2019 08:59:45
data collected Mon, 08 Apr 2019 11:36:19
也可以在浏览器中输出http://192.168.175.11:2812/ 输入用户名admin和密码monit进入web页面查看状态
四、获取Monit帮助信息
命令行输入：
monit -h
Usage: monit [options]+ [command]
Options are as follows:
-c file Use this control file
-d n Run as a daemon once per n seconds
-g name Set group name for monit commands
-l logfile Print log information to this file
-p pidfile Use this lock file in daemon mode
-s statefile Set the file monit should write state information to
-I Do not run in background (needed when run from init)
--id Print Monit's unique ID
--resetid Reset Monit's unique ID. Use with caution
-B Batch command line mode (do not output tables or colors)
-t Run syntax check for the control file
-v Verbose mode, work noisy (diagnostic output)
-vv Very verbose mode, same as -v plus log stacktrace on error
-H [filename] Print SHA1 and MD5 hashes of the file or of stdin if the
filename is omited; monit will exit afterwards
-V Print version number and patchlevel
-h Print this text
Optional commands are as follows:
start all - Start all services
start <name> - Only start the named service
stop all - Stop all services
stop <name> - Stop the named service
restart all - Stop and start all services
restart <name> - Only restart the named service
monitor all - Enable monitoring of all services
monitor <name> - Only enable monitoring of the named service
unmonitor all - Disable monitoring of all services
unmonitor <name> - Only disable monitoring of the named service
reload - Reinitialize monit
status [name] - Print full status information for service(s)
summary [name] - Print short status information for service(s)
report [up|down|..] - Report state of services. See manual for options
quit - Kill the monit daemon process
validate - Check all services and start if not running
procmatch <pattern> - Test process matching pattern
