Systemctl服务开始与Bash脚本

huangapple
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英文:

Systemctl Services start with Bash Script

问题

我有一个启动脚本，检查服务是否处于活动/非活动状态，并在必要时启动它：

  1. !/usr/bin/sh
  3. # 设置捕获错误的陷阱
  4. trap 'catch $? $LINENO' ERR
  6. function catch() {
  7.   echo "发生错误，行号：$2，退出状态：$1"
  8.   exit 1
  9. }
  11. # 设置脚本在错误发生时立即退出
  12. #set -e
  14. # 定义服务列表
  15. SERVICES=(service1 service2 service3)
  16. for service in $SERVICES
  17. do
  18. echo "检查 $service 状态"
  19. STATUS="$(systemctl is-active $service)"
  20. echo "状态为 ${STATUS}"
  21. RUNNING="$(systemctl show -p SubState $service | cut -d'=' -f2)"
  22. echo "运行状态为 $RUNNING"
  23. if [ "${STATUS}" = "active" ]; then
  24.         echo "$service 服务处于活动状态"
  25.         if [ "${RUNNING}" = "running" ]; then
  26.                 echo "$service 服务正在运行"
  27.         else
  28.                 echo "$service 服务未运行"
  29.         fi
  30. else
  31.         echo "对于 $service 返回 ${STATUS}。正在启动..."
  32.         systemctl start $service
  33.         echo "$service 已启动"
  34. fi
  35. done

运行 'sh start.sh' 时，我得到 '发生错误，行号：19，退出状态：3'。这是什么原因？我没有看到任何语法错误。

英文:

I have a start script that checks if the service is active/inactive and starts it if necessary:

  1. !/usr/bin/sh
  3. # Set up the trap to catch errors
  4. trap 'catch $? $LINENO' ERR
  6. function catch() {
  7.   echo "An error occurred on line $2 with exit status $1"
  8.   exit 1
  9. }
  11. # Set the script to exit immediately on errors
  12. #set -e
  14. # define the services list
  15. SERVICES=(service1 service2 service3)
  16. for service in $SERVICES
  17. do
  18. echo "Checking $service status"
  19. STATUS="$(systemctl is-active $service)"
  20. echo "status is ${STATUS}"
  21. RUNNING="$(systemctl show -p SubState $service | cut -d'=' -f2)"
  22. echo "Running status is $RUNNING"
  23. if [ "${STATUS}" = "active" ]; then
  24.         echo "$service Service is Active"
  25.         if [ "${RUNNING}" = "running" ]; then
  26.                 echo "$service Service is Running"
  27.         else
  28.                 echo "$service Service Not Running"
  29.         fi
  30. else
  31.         echo "Returned ${STATUS} for $service. Starting it... "
  32.         systemctl start $service
  33.         echo "$service started"
  34. fi
  35. done

When running 'sh start.sh' I get 'An error occurred on line 19 with exit status 3'
What is the cause for it ? I do not see any syntax errors.

答案1

得分: 1

Systemctl 手册页：如果没有活跃单元，则 is-active 可以返回非零的退出代码。

  1. is-active 模式...
  2.            检查指定的单元是否有任何活跃（即运行中）。如果至少有一个单元活跃，则返回退出代码 0，
  3.            否则返回非零代码。除非指定 --quiet，否则还会将当前单元状态输出到标准输出。

https://www.freedesktop.org/software/systemd/man/systemctl.html#Exit%20status

英文:

Systemctl man page: is-active can return an exit code non-zero if no active

  1. is-active PATTERN...
  2.            Check whether any of the specified units are active (i.e.
  3.            running). Returns an exit code 0 if at least one is active,
  4.            or non-zero otherwise. Unless --quiet is specified, this will
  5.            also print the current unit state to standard output.

https://www.freedesktop.org/software/systemd/man/systemctl.html#Exit%20status

huangapple
  • 本文由 发表于 2023年4月19日 23:58:43
  • 转载请务必保留本文链接：https://go.coder-hub.com/76056585.html
  • bash
  • linux
  • systemctl
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