systemd无法识别pid文件

Question

所以我试图在启用 systemd 的系统上启动服务。服务名称是ossec-hids-authdossec（入侵检测软件）中的身份验证引擎（代理）。当我去启动 init 脚本然后 systemctl 超时并且在获取状态时我看到这个错误。

/etc/init.d/ossec-hids-authd status
? ossec-hids-authd.service - LSB: Authentication Daemon for OSSEC-HIDS.
   Loaded: loaded (/etc/rc.d/init.d/ossec-hids-authd; bad; vendor preset: disabled)
   Active: failed (Result: timeout) since Thu 2018-02-22 07:34:28 UTC; 11min ago
     Docs: man:systemd-sysv-generator(8)

Feb 22 07:24:11 ip-10-0-197-117.ec2.internal systemd[1]: Starting LSB: Authentication Daemon for OSSEC-HIDS....
Feb 22 07:24:11 ip-10-0-197-117.ec2.internal ossec-hids-authd[21142]: [39B blob data]
Feb 22 07:24:11 ip-10-0-197-117.ec2.internal systemd[1]: PID file /var/run/ossec-authd.pid not readable (yet?) after start.
Feb 22 07:24:11 ip-10-0-197-117.ec2.internal ossec-hids-authd[21142]: 2018/02/22 07:24:11 ossec-authd: INFO: Started (pid: 21148).
Feb 22 07:34:28 ip-10-0-197-117.ec2.internal systemd[1]: ossec-hids-authd.service start operation timed out. Terminating.
Feb 22 07:34:28 ip-10-0-197-117.ec2.internal systemd[1]: Failed to start LSB: Authentication Daemon for OSSEC-HIDS..
Feb 22 07:34:28 ip-10-0-197-117.ec2.internal systemd[1]: Unit ossec-hids-authd.service entered failed state.
Feb 22 07:34:28 ip-10-0-197-117.ec2.internal systemd[1]: ossec-hids-authd.service failed.
Feb 22 07:40:20 ip-10-0-197-117.ec2.internal ossec-hids-authd[21142]: 2018/02/22 07:40:20 ossec-authd(1225): INFO: SIGNAL [(15)-(Terminated)] Received. Exit Cleaning...

现在在 init 脚本中，这个过程实际上是在创建 pid 文件/var/ossec/var/run而不是/var/run我检查了 pid 文件实际上是在那里创建的。但不知何故 systemctl 无法识别它。

systemd 是否有可能无法识别在外部创建的 pid 文件/var/run，如果是这种情况怎么办？

下面是初始化脚本

#!/bin/sh
#
# ossec-authd  Start the OSSEC-HIDS Authentication Daemon
#
# chkconfig: 2345 99 01
# description: Provides key signing for OSSEC Clients
# processname: ossec-authd
# config: /var/ossec/etc/ossec.conf
# pidfile: /var/run/ossec-authd.pid
### BEGIN INIT INFO
# Provides:          ossec-authd
# Required-Start:    $network $local_fs $remote_fs
# Required-Stop:     $network $local_fs $remote_fs
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6
# Short-Description: Authentication Daemon for OSSEC-HIDS.
# Description:       Provides key signing for OSSEC Clients
### END INIT INFO

# Author: Brad Lhotsky <brad.lhotsky@gmail.com>
NAME=ossec-authd
DAEMON=/var/ossec/bin/ossec-authd
DAEMON_ARGS="-p 1515 2>&1 >> /var/ossec/logs/ossec-authd.log &"
PIDDIR=/var/ossec/var/run
SCRIPTNAME=/etc/init.d/ossec-authd

. /etc/rc.d/init.d/functions

getpid() {
    for filename in $PIDDIR/${NAME}*.pid; do
        pidfile=$(basename $filename)
        pid=$(echo $pidfile |cut -d\- -f 3 |cut -d\. -f 1)
        kill -0 $pid &> /dev/null
        RETVAL=$?
        if [ $RETVAL -eq 0 ]; then
            PIDFILE=$filename
            PID=$pid
        else
            rm -f $filename
        fi;
    done;
}

start() {
  echo -n $"Starting $NAME: "
  daemon $DAEMON $DAEMON_ARGS
  retval=$?
  if [ $retval -eq 0 ]; then
    echo_success
    echo
  else
    echo_failure
    echo
  fi
  return $retval
}

stop() {
  echo -n $"Stopping $NAME: "
  getpid
  killproc -p $PIDFILE $NAME
  retval=$?
  echo
  return $retval
}

restart() {
  stop
  start
}

case "$1" in
  start)
    start
    ;;
  stop)
    stop
    ;;
  status)
    getpid
    if [ -z $PIDFILE ]; then
        status $NAME
    else
        status -p $PIDFILE $NAME
    fi;
    ;;
  restart)
    restart
    ;;
  *)
    echo "Usage: $0 {start|stop|status}"
    exit 2
    ;;
esac

exit $?

Answer 1

systemd 解析 init 脚本的注释以在启动或daemon-reload命令时生成临时 .service 文件。换线

# pidfile: /var/run/ossec-authd.pid

到

# pidfile: /var/ossec/var/run/ossec-authd.pid

并运行 systemctl daemon-reload

UPD：现在我看到 pid 文件名是在运行时由 authd 生成的，init 脚本必须搜索 $PIDDIR/${NAME}*.pid。

Systemd 无法搜索 pidfile，但可以在没有它的情况下工作。所以你可以尝试# pidfile:完全删除行，或者编写自己的 .service 文件