Question

运行Ubuntu 17.04，我希望有一个systemctl服务来监督主bash脚本，其中有三个程序（这里用虚拟脚本foo_script替换为参数标记）在无限循环下运行（因为程序可能崩溃）。

如果从命令行调用，主脚本foo_main.sh可以正常工作;但是我试图建立的服务很快崩溃了。

档案foo_script.sh：

#!/bin/bash

echo "FooScripting "$1 >> "foo.d/"$1

档案loop.sh：

#!/bin/bash

nLoop=0
prgName=$1
prgArg=$2

echo "<< START of "${prgName} ${prgArg}" loop >>"

while :
do
    let nLoop=nLoop+1
    echo "<< looping "${prgName} ${prgArg}" >>" ${nLoop}
    "./"${prgName} ${prgArg}
    sleep 1
done

echo "<< END of "${prgName} ${prgArg}" loop >>"

档案foo_main.sh：

#!/bin/bash

echo "foo_main start in "${PWD}

./loop.sh "foo_script.sh" "fb" &
sleep 2
./loop.sh "foo_script.sh" "gc" &
./loop.sh "foo_script.sh" "gb" &

echo "foo_main end"

档案/etc/systemd/system/food.service：

[Unit]
Description = Foo Daemon
After = network.target

[Service]
Type = simple
# User = <<USER>>
# PIDFile=/var/food.pid
WorkingDirectory = /home/john/bin
ExecStart = /home/john/bin/foo_main.sh
# ExecStop = killall loop.sh
# ExecReload = killall loop.sh && /home/john/bin/foo_main.sh
# Restart = on-abort

[Install]
WantedBy = multi-user.target

我从每个sudo systemctl status food.service获得的内容（在start ofc之后）几乎都是相同的输出

●food.service - Foo Daemon

已加载：已加载（/etc/systemd/system/food.service;已禁用;供应商预设：已启用）

活跃：无效（死亡）

Sep 28 14:54:30 john-host systemd [1]：启动Foo Daemon。

Sep 28 14:54:30 john-host foo_main.sh [7376]：foo_main脚本在/ home / john / bin中启动

Sep 28 14:54:30 john-host foo_main.sh [7376]：＆lt;＆lt;启动foo_script.sh fb loop＆gt;＆gt;

Sep 28 14:54:30 john-host foo_main.sh [7376]：＆lt;＆lt;循环foo_script.sh fb＆gt;＆gt; 1

Sep 28 14:54:31 john-host foo_main.sh [7376]：＆lt;＆lt;循环foo_script.sh fb＆gt;＆gt; 2

Sep 28 14:54:32 john-host foo_main.sh [7376]：foo_main script end

Sep 28 15:24:30 john-host foo_main.sh [7921]：＆lt;＆lt;启动foo_script.sh gb loop＆gt;＆gt;

Sep 28 15:24:30 john-host foo_main.sh [7921]：＆lt;＆lt;启动foo_script.sh gc loop＆gt;＆gt;

Sep 28 15:24:30 john-host foo_main.sh [7921]：＆lt;＆lt;循环foo_script.sh gb＆gt;＆gt; 1

Sep 28 15:24:30 john-host foo_main.sh [7921]：＆lt;＆lt;循环foo_script.sh gc＆gt;＆gt; 1

Answer 1

另一种解决方案是在Type=oneshot

中使用RemainAfterExit=yes + /etc/systemd/system/food.service

请https://www.freedesktop.org/software/systemd/man/systemd.service.html查看 onshot 类型的服务。

以下服务文件也可以解决您的问题。

[Unit]
Description = Foo Daemon
After = network.target

[Service]
Type = oneshot
RemainAfterExit=yes
# User = <<USER>>
# PIDFile=/var/food.pid
WorkingDirectory = /home/john/bin
ExecStart = /home/john/bin/foo_main.sh
# ExecStop = killall loop.sh
# ExecReload = killall loop.sh && /home/john/bin/foo_main.sh
# Restart = on-abort

[Install]
WantedBy = multi-user.target

Answer 2

已解决...服务已停止，因为其执行流程以foo_main.sh结束。添加像

这样的东西就足够了

# ...
./loop.sh "foo_script.sh" "endless_dummy_loop"

没有背景＆符号，位于foo_main.sh的末尾。

显然，真正的服务与此截然不同，但我现在明白了这一点。

Linux Service意外死亡

2 个答案: