自动启动服务

自动启动服务

我正在寻找一种方法来配置服务,使其在因某种原因停止时自动运行。目前,我已设置了一个 cronjob,用于每分钟检查服务是否正在运行,并在服务崩溃时重新启动它,但这似乎很无聊。我该如何正确做到这一点?

我添加了一些可疑的脚本来使服务正常运行,您可以在下面看到

x@x:~$ sudo cat /etc/init.d/my-service
#!/bin/sh
### BEGIN INIT INFO
# Provides: my-service
# Required-Start:    $remote_fs $syslog
# Required-Stop:     $remote_fs $syslog
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: Start daemon at boot time
# Description:       Enable service provided by daemon.
### END INIT INFO

dir="/var/www/html/my-service"
cmd="nodejs chat.js"
user="www-data"

name=`basename $0`
pid_file="/var/run/$name.pid"
stdout_log="/var/log/$name.log"
stderr_log="/var/log/$name.err"

get_pid() {
    cat "$pid_file"
}

is_running() {
    [ -f "$pid_file" ] && ps `get_pid` > /dev/null 2>&1
}

case "$1" in
    start)
    if is_running; then
        echo "Already started"
    else
        echo "Starting $name"
        cd "$dir"
        if [ -z "$user" ]; then
            sudo $cmd >> "$stdout_log" 2>> "$stderr_log" &
        else
            sudo -u "$user" $cmd >> "$stdout_log" 2>> "$stderr_log" &
        fi
        echo $! > "$pid_file"
        if ! is_running; then
            echo "Unable to start, see $stdout_log and $stderr_log"
            exit 1
        fi
    fi
    ;;
    stop)
    if is_running; then
        echo -n "Stopping $name.."
        kill `get_pid`
        for i in {1..10}
        do
            if ! is_running; then
                break
            fi

            echo -n "."
            sleep 1
        done
        echo

        if is_running; then
            echo "Not stopped; may still be shutting down or shutdown may have f                                                                                                                               ailed"
            exit 1
        else
            echo "Stopped"
            if [ -f "$pid_file" ]; then
                rm "$pid_file"
            fi
        fi
    else
        echo "Not running"
    fi
    ;;
    restart)
    $0 stop
    if is_running; then
        echo "Unable to stop, will not attempt to start"
        exit 1
    fi
    $0 start
    ;;
    status)
    if is_running; then
        echo "Running"
    else
        echo "Stopped"
        exit 1
    fi
    ;;
    *)
    echo "Usage: $0 {start|stop|restart|status}"
    exit 1
    ;;
esac

exit 0

还有 my-service.service

x@x:~$ cat /etc/systemd/system/my-service.service
[Unit]
Description=my-service daemon

[Service]
ExecStart=/usr/bin/nodejs /var/www/html/my-service/chat.js
Type=simple
User=root
Group=root
Restart=always

[Install]
WantedBy=multi-user.target

例如,当机器重新启动时,我会得到此状态

Jan 24 10:54:41 x systemd[1]: my-service.service: Service hold-off time over, scheduling restart.
Jan 24 10:54:41 x systemd[1]: Stopped my-service daemon.
Jan 24 10:54:41 x systemd[1]: my-service.service: Start request repeated too quickly.
Jan 24 10:54:41 x systemd[1]: Failed to start my-service daemon.

答案1

您可以使用监控工具。它非常小并且对于任何类型的流程管理和监控都很有用。

从以下位置下载二进制包后此链接,您可以将其解压到系统上的任何文件夹,然后将包中的两个文件复制到您的系统中进行安装:

cd /path/to/monit/folder
cp ./bin/monit /usr/sbin/monit
cp ./conf/monitrc /etc/monitrc  

现在/etc/monitrc根据您的需要进行编辑(参考文件)然后创建一个初始化控制文件在启动时启用 monit。现在以这种方式启动 monit:

initctl reload-configuration
start monit

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