021_supervise进行管理利器

一、公司的类似ansible的工具也是用supervise管理的

[admin@mjyall-test-1 /service/ansible-oc-agent]$ ps -ef|grep 19070
root     19070 19068  0 00:44 ?        00:00:00 svscan /service
root     19072 19070  0 00:44 ?        00:00:00 supervise ansible-oc-agent
root     19073 19070  0 00:44 ?        00:00:00 supervise log
[admin@mjyall-test-1 /service/ansible-oc-agent]$ sudo tree .
.
├── log
│   ├── run
│   └── supervise
│       ├── control
│       ├── lock
│       ├── ok
│       └── status
├── run
└── supervise
    ├── control
    ├── lock
    ├── ok
    └── status

3 directories, 10 files
[admin@mjyall-test-1 /service/ansible-oc-agent]$ cat run
#!/bin/bash

. /etc/profile

mkdir -p /opt/ansible-oc-agent/cache
cd /opt/eoc-agent

exec 2>&1
exec /opt/ansible-oc-agent/bin/startup.sh

二、常用命令集合。

#官网:https://cr.yp.to/daemontools/svc.html
svc -d /service/eoc-agent && sleep 10  &&  svc -k /service/eoc-agent  && svc -u /service/eoc-agent       #重启eoc-agent
svstat /service/eoc-agent  #查看jyalloc-agent状态

   svc -d /service/eoc-agent  关闭

   svc -u /service/eoc-agent  打开

三、daemontools自带命令详解

[root@xxx-opstools-2 /opt/ops/cmdb]# rpm -ql daemontools
/usr/bin/envdir
/usr/bin/envuidgid
/usr/bin/fghack
/usr/bin/multilog
/usr/bin/pgrphack
/usr/bin/readproctitle
/usr/bin/setlock
/usr/bin/setuidgid
/usr/bin/softlimit
/usr/bin/supervise
/usr/bin/svc
/usr/bin/svok
/usr/bin/svscan
/usr/bin/svscanboot
/usr/bin/svstat
/usr/bin/tai64n
/usr/bin/tai64nlocal
cat /usr/lib/systemd/system/daemontools.service      systemctl status daemontools   #查看通过daemontools控制的服务的状态

[Unit]
   Description=daemontools
   After=sysinit.target

[Service]
   ExecStart=/usr/bin/svscanboot
   Restart=always

[Install]
   WantedBy=multi-user.target

(1)envdir   设置环境变量用的, Reference:https://cr.yp.to/daemontools/envdir.html

(2)envuidgid  设置运行脚本的uid and gid, Reference:https://cr.yp.to/daemontools/envuidgid.html

(3)fghack   fghack is an anti-backgrounding tool.   Reference:https://cr.yp.to/daemontools/fghack.html

(4)multilog  multilog reads a sequence of lines from stdin and appends selected lines to any number of logs.

root      2386  2384  0  2017 ?        00:00:25 multilog t s10485760 n5 /opt/eoc-agent/logs

<1>解释下这里"t"时间戳的意义:

Timestamping
The action
     t
inserts an @, a precise timestamp, and a space in front of each line, using the same format as tai64n. This is required to be the first action.
Patterns apply to the line after the timestamp is inserted. For example, if

     multilog t '-*' '+* fatal: *' ./main
reads the line
     fatal: out of memory
then it will log a line such as
     @400000003b4a39c23294b13c fatal: out of memory
with the first * matching the timestamp.
You can use tai64nlocal to convert these timestamps to human-readable form.

<2>Automatically rotated logs日志文件解释

日志文件大小size must be between 4096 and 16777215. The default maximum file size is 99999.单位为byte

@表示已经写完的老的文件,current表示当前正在写的

.s: This file is completely processed and safely written to disk.
.u: This file was being created at the moment of an outage. It may have been truncated. It has not been processed.

(5)pgrphack    pgrphack runs a program in a separate process group.

(6)readproctitle maintains an automatically rotated log in memory for inspection by ps.

(7)setlock runs another program with a file locked.

(8)setuidgid runs another program under a specified account's uid and gid.

(9)softlimit runs another program with new resource limits.

(10)supervise starts and monitors a service.

也可以用svc()进行启动<https://cr.yp.to/daemontools/svc.html>.

状态查看使用svstat()<https://cr.yp.to/daemontools/svstat.html>.

svok检查是否服务是ok的<https://cr.yp.to/daemontools/svok.html>.

svscan to reliably start a collection of supervise processes(批量启动supervisor服务,上限为1000个子目录,而且它是永久启动的,并且会不断扫描新的目录)<https://cr.yp.to/daemontools/svscan.html>.

(11)启动服务

svscanboot starts svscan in the /service directory

(12) tai64n puts a precise timestamp on each line.

(13)tai64nlocal converts precise TAI64N timestamps to a human-readable format.

If a line begins with @, tai64nlocal looks for a timestamp after the @, in the format printed by tai64n, and writes the line to stdout with the timestamp converted to local time in ISO format: YYYY-MM-DD HH:MM:SS.SSSSSSSSS.

Reference:

https://cr.yp.to/daemontools.html

https://isotope11.com/blog/manage-your-services-with-daemontools

https://blog.csdn.net/u012373815/article/details/70217030