测试服务是否在脚本中运行的“正确”方法

#1 楼

systemctl is-active --quiet service

systemctl is-active --quiet service && echo Service is running

#2 楼

$ systemctl show -p SubState --value NetworkManager
running

$ systemctl show -p ActiveState --value x11-common
inactive
$ systemctl show -p SubState --value x11-common
dead

show [PATTERN...|JOB...]
           Show properties of one or more units, jobs, or the manager
           itself. If no argument is specified, properties of the
           manager will be shown. If a unit name is specified, properties
           of the unit are shown, and if a job ID is specified,
           properties of the job are shown. By default, empty properties
           are suppressed. Use --all to show those too. To select specific
           properties to show, use --property=. This command is intended
           to be used whenever computer-parsable output is required. Use
           status if you are looking for formatted human-readable output.

-p, --property=
           When showing unit/job/manager properties with the show command,
           limit display to properties specified in the argument. The
           argument should be a comma-separated list of property names,
           such as "MainPID". Unless specified, all known properties are
           shown. If specified more than once, all properties with the
           specified names are shown. Shell completion is implemented for
           property names.

--value
           When printing properties with show, only print the value, and
           skip the property name and "=".

systemctl show -a polkit

$ systemctl show - polkit | grep Active
ActiveState=active
ActiveEnterTimestamp=Thu 2020-07-02 07:24:40 IST
ActiveEnterTimestampMonotonic=6682102
ActiveExitTimestamp=
ActiveExitTimestampMonotonic=0

#3 楼

$ systemctl show -p ActiveState sshd | sed 's/ActiveState=//g'
active
$ systemctl show -p SubState sshd | sed 's/SubState=//g'  
running

#4 楼

systemctl is-active --quiet <service name> || <service name> restart

#5 楼

 STATUS="$(systemctl is-active tomcat.service)"
if [ "${STATUS}" = "active" ]; then
    echo "Execute your tasks ....."
else 
    echo " Service not running.... so exiting "  
    exit 1  
fi
 

 systemctl -q is-active tomcat.service  && \
echo "Tomcat Runnung" || \
echo "Service is not running at all "
 

#6 楼

#7 楼

$ systemctl show -p ActiveState sshd | cut -d'=' -f2
active
$ systemctl show -p SubState sshd | cut -d'=' -f2
running

#8 楼

$ ps -C notification-daemon
  PID TTY          TIME CMD
 7418 ?        00:00:04 notification-da

$ ps -C notification-daemon-fake
  PID TTY          TIME CMD
 7418 ?        00:00:04 notification-da

$ ps -C notification
  PID TTY          TIME CMD

#9 楼

service mysql status > /dev/null ||     service mysql start &
service ssh status > /dev/null ||     service ssh start &
service php7.4-fpm status > /dev/null ||     service php7.4-fpm start &
service redis-server status > /dev/null ||     service redis-server start &
service nginx status > /dev/null ||     service nginx start  &
service cron status > /dev/null ||     service cron start &

#10 楼

#!/bin/bash
service=replace_me_with_a_valid_service

if (( $(ps -ef | grep -v grep | grep $service | wc -l) > 0 ))
then
  echo "$service is running!!!"
else
  /etc/init.d/$service start
fi

#11 楼

 #!/bin/bash

if [ "$#" = 0 ]; then
  echo "Usage wasdkiller@kushan:~$ sudo service docker status
● docker.service - Docker Application Container Engine
   Loaded: loaded (/lib/systemd/system/docker.service; enabled; vendor preset: enabled)
   Active: active (running) since Tue 2020-09-22 14:30:59 +0530; 6min ago
     Docs: https://docs.docker.com
 Main PID: 25220 (dockerd)
    Tasks: 17
   CGroup: /system.slice/docker.service
           └─25220 /usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock

සැප් 22 14:30:59 kushan dockerd[25220]: time="2020-09-22T14:30:59.033698487+05:30" level=warning msg="Your kernel does not support cgroup rt runtime"
සැප් 22 14:30:59 kushan dockerd[25220]: time="2020-09-22T14:30:59.033703758+05:30" level=warning msg="Your kernel does not support cgroup blkio weight"
සැප් 22 14:30:59 kushan dockerd[25220]: time="2020-09-22T14:30:59.033707702+05:30" level=warning msg="Your kernel does not support cgroup blkio weight_device"
සැප් 22 14:30:59 kushan dockerd[25220]: time="2020-09-22T14:30:59.033812954+05:30" level=info msg="Loading containers: start."
සැප් 22 14:30:59 kushan dockerd[25220]: time="2020-09-22T14:30:59.101347726+05:30" level=info msg="Default bridge (docker0) is assigned with an IP address 172.17.0.0/16. Daemon option --bip can be used to 
සැප් 22 14:30:59 kushan dockerd[25220]: time="2020-09-22T14:30:59.130162694+05:30" level=info msg="Loading containers: done."
සැප් 22 14:30:59 kushan dockerd[25220]: time="2020-09-22T14:30:59.172380859+05:30" level=info msg="Docker daemon" commit=48a66213fe graphdriver(s)=overlay2 version=19.03.12
සැප් 22 14:30:59 kushan dockerd[25220]: time="2020-09-22T14:30:59.172860484+05:30" level=info msg="Daemon has completed initialization"
සැප් 22 14:30:59 kushan dockerd[25220]: time="2020-09-22T14:30:59.228633124+05:30" level=info msg="API listen on /var/run/docker.sock"
සැප් 22 14:30:59 kushan systemd[1]: Started Docker Application Container Engine.
lines 1-19/19 (END)
wasdkiller@kushan:~$
wasdkiller@kushan:~$
wasdkiller@kushan:~$ 
wasdkiller@kushan:~$ source check_service.sh docker
Service docker is running
wasdkiller@kushan:~$
 "
  exit 0
fi

service=
is_running=$(ps aux | grep -v grep | grep -v "wasdkiller@kushan:~$ sudo service docker stop
wasdkiller@kushan:~$ sudo service docker status
● docker.service - Docker Application Container Engine
   Loaded: loaded (/lib/systemd/system/docker.service; enabled; vendor preset: enabled)
   Active: inactive (dead) since Tue 2020-09-22 14:41:00 +0530; 3s ago
     Docs: https://docs.docker.com
  Process: 25220 ExecStart=/usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock (code=exited, status=0/SUCCESS)
 Main PID: 25220 (code=exited, status=0/SUCCESS)

සැප් 22 14:30:59 kushan dockerd[25220]: time="2020-09-22T14:30:59.130162694+05:30" level=info msg="Loading containers: done."
සැප් 22 14:30:59 kushan dockerd[25220]: time="2020-09-22T14:30:59.172380859+05:30" level=info msg="Docker daemon" commit=48a66213fe graphdriver(s)=overlay2 version=19.03.12
සැප් 22 14:30:59 kushan dockerd[25220]: time="2020-09-22T14:30:59.172860484+05:30" level=info msg="Daemon has completed initialization"
සැප් 22 14:30:59 kushan dockerd[25220]: time="2020-09-22T14:30:59.228633124+05:30" level=info msg="API listen on /var/run/docker.sock"
සැප් 22 14:30:59 kushan systemd[1]: Started Docker Application Container Engine.
සැප් 22 14:41:00 kushan systemd[1]: Stopping Docker Application Container Engine...
සැප් 22 14:41:00 kushan dockerd[25220]: time="2020-09-22T14:41:00.691599535+05:30" level=info msg="Processing signal 'terminated'"
සැප් 22 14:41:00 kushan dockerd[25220]: time="2020-09-22T14:41:00.692925147+05:30" level=info msg="stopping event stream following graceful shutdown" error="<nil>" module=libcontainerd namespace=moby
සැප් 22 14:41:00 kushan dockerd[25220]: time="2020-09-22T14:41:00.693778800+05:30" level=info msg="Daemon shutdown complete"
සැප් 22 14:41:00 kushan systemd[1]: Stopped Docker Application Container Engine.
wasdkiller@kushan:~$ 
wasdkiller@kushan:~$ 
wasdkiller@kushan:~$ 
wasdkiller@kushan:~$ source check_service.sh docker
Found startap script /etc/init.d/docker. Start it? Y/n ? y
Starting service...
[ ok ] Starting docker (via systemctl): docker.service.
wasdkiller@kushan:~$ 
" | grep $service | wc -l | awk '{print }')

if [ $is_running != "0" ]; then
  echo "Service $service is running"
else
  initd=$(ls /etc/init.d/ | grep $service | wc -l | awk '{ print  }')

  if [ $initd = "1" ]; then
    startup=$(ls /etc/init.d/ | grep $service)
    echo -n "Found startap script /etc/init.d/${startup}. Start it? Y/n ? "
    read answer

    if [ $answer = "y" -o $answer = "Y" ]; then
      echo "Starting service..."
      /etc/init.d/${startup} start
    fi
  else
    echo "Service $service not yet installed"
  fi
fi
 

 wasdkiller@kushan:~$ sudo service docker123 status
Unit docker123.service could not be found.
wasdkiller@kushan:~$ 
wasdkiller@kushan:~$ 
wasdkiller@kushan:~$ 
wasdkiller@kushan:~$ source check_service.sh docker123
Service docker123 not yet installed
wasdkiller@kushan:~$
 

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 q4312079q