【21.03】vma服reload后，状态变成inactive

【环境信息】
硬件信息：
1）虚拟机内存：4 GiB vCPU：1
软件信息：
openeulerversion=openEuler-21.03
compiletime=2021-02-23-17-45-36
gccversion=9.3.1-20210204.16.oe1
kernelversion=5.10.0-2.0.0.11.oe1
openjdkversion=1.8.0.282.b08-5.oe1
arch:arm x86
【问题复现步骤】
1、systemctl start vma
2、systemctl reload vma
出现概率：必现
【预期结果】
reload后的服务状态为active
【实际结果】
reload后的服务状态为inactive
【附件信息】
比如系统message日志/组件日志、dump信息、图片等
输入图片说明

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问题分析 ：
这个问题历史版本就存在，reload其实执行的是restart，restart命令先执行stop，再执行start

vma.service

……
[Service]
Type=forking
Restart=on-failure
ExecStart=@prefix@/sbin/vma start
ExecStop=@prefix@/sbin/vma stop
ExecReload=@prefix@/sbin/vma restart
RestartForceExitStatus=1 SIGTERM
……

/usr/sbin/vma

……
function do_restart()
{
    do_stop
    do_start
}
……
case "$1" in
    start)
        do_check
        do_start
        ;;
    stop)
        do_check
        do_stop
        ;;
    status)
        do_status
        ;;
    restart | force-reload)
        do_check
        do_restart
        ;;
    *)
……

参考：
https://github.com/Mellanox/libvma/blob/5f3329b1ec20801785136d303e489644fcf330d5/contrib/scripts/vma.service.in
https://github.com/Mellanox/libvma/blob/5f3329b1ec20801785136d303e489644fcf330d5/contrib/scripts/vma.init.in

解决思路 ：

通过先systemctl stop vma，再systemctl start vma模拟reload，服务操作正常
systemctl reload vma，多执行了一次stop

[root@localhost ipsec.d]# systemctl start vma
[root@localhost ipsec.d]# systemctl status vma
● vma.service - VMA Daemon. Version: 8.9.4-0
     Loaded: loaded (/usr/lib/systemd/system/vma.service; enabled; vendor preset: disabled)
     Active: active (running) since Mon 2021-03-08 18:45:33 CST; 5s ago
    Process: 51017 ExecStart=/usr/sbin/vma start (code=exited, status=0/SUCCESS)
   Main PID: 51023 (vmad)
      Tasks: 1 (limit: 1428)
     Memory: 1.9M
     CGroup: /system.slice/vma.service
             └─51023 /usr/sbin/vmad

3月 08 18:45:32 localhost.localdomain systemd[1]: Starting VMA Daemon. Version: 8.9.4-0...
3月 08 18:45:33 localhost.localdomain vma[51017]: Starting vmad: [  OK  ]
3月 08 18:45:33 localhost.localdomain systemd[1]: Started VMA Daemon. Version: 8.9.4-0.
[root@localhost ipsec.d]# systemctl reload vma
[root@localhost ipsec.d]# systemctl status vma
● vma.service - VMA Daemon. Version: 8.9.4-0
     Loaded: loaded (/usr/lib/systemd/system/vma.service; enabled; vendor preset: disabled)
     Active: inactive (dead) since Mon 2021-03-08 18:45:51 CST; 1s ago
    Process: 51017 ExecStart=/usr/sbin/vma start (code=exited, status=0/SUCCESS)
    Process: 51029 ExecReload=/usr/sbin/vma restart (code=exited, status=0/SUCCESS)
    Process: 51040 ExecStop=/usr/sbin/vma stop (code=exited, status=0/SUCCESS)
   Main PID: 51023 (code=exited, status=0/SUCCESS)

3月 08 18:45:32 localhost.localdomain systemd[1]: Starting VMA Daemon. Version: 8.9.4-0...
3月 08 18:45:33 localhost.localdomain vma[51017]: Starting vmad: [  OK  ]
3月 08 18:45:33 localhost.localdomain systemd[1]: Started VMA Daemon. Version: 8.9.4-0.
3月 08 18:45:48 localhost.localdomain systemd[1]: Reloading VMA Daemon. Version: 8.9.4-0.
3月 08 18:45:49 localhost.localdomain vma[51029]: Shutting down vmad: [  OK  ]
3月 08 18:45:49 localhost.localdomain vmad[51037]: [INFO  ] Starting
3月 08 18:45:50 localhost.localdomain vma[51029]: Starting vmad: [  OK  ]
3月 08 18:45:51 localhost.localdomain vma[51040]: Shutting down vmad: [  OK  ]
3月 08 18:45:51 localhost.localdomain systemd[1]: vma.service: Succeeded.
3月 08 18:45:51 localhost.localdomain systemd[1]: Reloaded VMA Daemon. Version: 8.9.4-0.

vma[51029]先执行stop，然后执行start，之后vma[51040]又执行了stop
多执行的stop，目前未找到原因……

解决方法：
21.03分支PR：!7:Remove ExecReload that is not supported

systemctl reload官方用法是加载服务自身的配置文件，比如xxx.conf、xxxrc，这里的reload按照restart的用法做了，而restart本身就存在，一是重复，二是用法不合理，三是这个命令有问题。
目前libvma本身没有加载配置文件的机制，即不支持这个功能，所以移除。

参考reload官方定义如下：
reload PATTERN…

Asks all units listed on the command line to reload their configuration.
Note that this will reload the service-specific configuration, not the unit configuration file of systemd.
If you want systemd to reload the configuration file of a unit, use the daemon-reload command.
In other words: for the example case of Apache, this will reload Apache's httpd.conf in the web server, not the apache.service systemd unit file.
This command should not be confused with the daemon-reload command.

https://www.freedesktop.org/software/systemd/man/systemctl.html

备注：其它发行版皆是不支持reload命令的

验证结果：

[root@localhost ipsec.d]# systemctl start vma
[root@localhost ipsec.d]# systemctl status vma
● vma.service - VMA Daemon. Version: 8.9.4-0
     Loaded: loaded (/usr/lib/systemd/system/vma.service; enabled; vendor preset: disabled)
     Active: active (running) since Wed 2021-03-10 10:33:50 CST; 1s ago
    Process: 58587 ExecStart=/usr/sbin/vma start (code=exited, status=0/SUCCESS)
   Main PID: 58593 (vmad)
      Tasks: 1 (limit: 1428)
     Memory: 2.0M
     CGroup: /system.slice/vma.service
             └─58593 /usr/sbin/vmad

3月 10 10:33:49 localhost.localdomain systemd[1]: Starting VMA Daemon. Version: 8.9.4-0...
3月 10 10:33:49 localhost.localdomain vmad[58592]: [INFO  ] Starting
3月 10 10:33:50 localhost.localdomain vma[58587]: Starting vmad: [  OK  ]
3月 10 10:33:50 localhost.localdomain systemd[1]: Started VMA Daemon. Version: 8.9.4-0.
[root@localhost ipsec.d]# systemctl reload vma
Failed to reload vma.service: Job type reload is not applicable for unit vma.service.

src-openEuler / libvma

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