bash 在 Linux Ubuntu 上将 jar 文件作为守护程序运行
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Run jar file as Daemon on Linux Ubuntu
提问by Henok
I want to install a bot to my Teamspeak3 and run this bot as a daemon on startup. I wrote my own script and copied it to init.d and then added it with update-rc.dto defaults.
我想在我的 Teamspeak3 上安装一个机器人，并在启动时将此机器人作为守护程序运行。我编写了自己的脚本并将其复制到 init.d，然后将其添加update-rc.d到默认值中。
#!/bin/sh
#
# JTS3ServerBot Script
#
USER="ts"
NAME="jts3"
DIR="/home/ts/jts3/"
case in
start)
echo "Starting ${NAME} ..."
if [ ! -f $DIR/pid ]; then
sudo -u $USER -c nohup java -jar $DIR/JTS3ServerMod.jar $DIR 2>> /dev/null >> /dev/null &
echo $! > $DIR/pid
echo "${NAME} started ..."
else
echo "${NAME} is already running ..."
fi
;;
stop)
if [ -f $DIR/pid ]; then
PID=$(cat $DIR/pid);
echo "Stopping ${NAME} ..."
kill $PID;
echo "${NAME} stopped ..."
rm $DIR/pid
else
echo "${NAME} is not running ..."
fi
;;
restart)
if [ -f $DIR/pid ]; then
PID=$(cat $DIR/pid);
echo "Stopping ${NAME} ...";
kill $PID;
echo "${NAME} stopped ...";
rm $DIR/pid
echo "Starting ${NAME} ..."
sudo -u $USER -c nohup java -jar $DIR/JTS3ServerMod.jar $DIR 2>> /dev/null >> /dev/null &
echo $! > $DIR/pid
echo "${NAME} started ..."
else
echo "${NAME} is not running ..."
fi
;;
esac
A pid file in generated, but if i try to kill the process with this pid i get an error that the process does not exist. If i use topthere is no process with the pid listed.
生成了一个 pid 文件，但是如果我尝试用这个 pid 终止进程，我会收到一个错误，表明该进程不存在。如果我使用top，则没有列出 pid 的进程。
root@vps-1023645-8462:~# service jts3 start
Starting jts3 ...
jts3 started ...
root@vps-1023645-8462:~# cat /home/ts/jts3/pid
10206
root@vps-1023645-8462:~# kill 10206
bash: kill: (10206) - No such process
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
1762 ts 20 0 1881m 14m 3408 S 0 1.4 215:47.28 ts3server_linux
32356 ts 20 0 164m 1576 1336 S 0 0.2 0:09.85 tsdnsserver_lin
回答by Henok
I have found another solution for my problem. I use upstart(works only with Ubuntu) to run my jar-File as a daemon. Upstart manages the PIDs. Just add myservice.confto /etc/init(not /etc/inid.d) and the daemon will be started on boot and you can mangage it as a service. You do not have to make the file runnable or anything else
我为我的问题找到了另一种解决方案。我使用upstart（仅适用于 Ubuntu）将我的 jar 文件作为守护程序运行。Upstart 管理 PID。只需添加myservice.conf到/etc/init(not /etc/inid.d)，守护程序将在启动时启动，您可以将其作为服务进行管理。您不必使文件可运行或其他任何东西
You can manage the service as normal for example
例如，您可以照常管理服务
service myservice restart
service myservice status
...
My Config-File:
我的配置文件：
description "myservice"
author "your name"
start on runlevel [3]
stop on shutdown
expect fork
script
cd /home/username/
sudo -u username java -jar /home/username/myservice/myservice.jar >/home/username/myservice.log 2>&1
emit myservice_running
end script
This solution is really easy and works well on my Ubuntu 12.04 Server.
这个解决方案非常简单，并且在我的 Ubuntu 12.04 服务器上运行良好。
回答by nobody
You have an error in this line:
你在这一行有一个错误：
sudo -u $USER -c nohup java -jar $DIR/JTS3ServerMod.jar $DIR 2>>/dev/null >>/dev/null&
You appear to be mixing the syntaxes of sudoand su. Before version 1.8, sudohad no -coption - you just give it the command to run after any other options. In 1.8 there is a -coption but it's not for specifying the command (it's for limiting resource usage to that of a given login class). sudois printing an error message about this invalid syntax, but you're not seeing it because you're redirecting all the output to /dev/null.
您似乎混合了sudo和的语法su。在 1.8 版之前，sudo没有-c选项 - 您只需给它命令以在任何其他选项之后运行。在 1.8 中有一个-c选项，但它不是用于指定命令（它用于将资源使用限制为给定登录类的资源）。sudo正在打印有关此无效语法的错误消息，但您没有看到它，因为您将所有输出重定向到/dev/null.
Simply remove the -cto form a valid command:
只需删除-c即可形成有效命令：
sudo -u $USER nohup java -jar $DIR/JTS3ServerMod.jar $DIR 2>> /dev/null >> /dev/null &
Also, you can simplify the command a little by using the 2>&1syntax to send stderrto the same handle as stdout, and there is no need for append mode when writing to /dev/null:
此外，您可以通过使用2>&1语法发送stderr到与 相同的句柄来稍微简化命令stdout，并且在写入时不需要附加模式/dev/null：
sudo -u $USER nohup java -jar $DIR/JTS3ServerMod.jar $DIR >/dev/null 2>&1 &
