ssh连接关闭后，通过Java在后台执行bash脚本 [英] Executing bash script via java in background after ssh connection is closed

问题描述

我正在使用Java在远程Linux机器上执行简单的bash脚本.

I am using java to execute a simple bash script on a remote linux machine.

名为"shortoracle.bash"的bash脚本具有以下脚本:

The bash script named "shortoracle.bash" have this script:

#!/bin/sh
runsql() {
   i="$1"
   end=$((SECONDS+360))
   SECONDS=0
   while (( SECONDS < end )); do
   echo "INSERT into table_$i (col1) values (CURRENT_TIMESTAMP);" | sqlplus username/password
   sleep 1
   done
}


for i in $(seq 1 10); do
 echo "DROP TABLE table_$i;" | sqlplus username/password
 echo "CREATE TABLE table_$i (col1 TIMESTAMP WITH TIME ZONE);" | sqlplus username/password
 runsql $i &
done
wait

简单来说:创建10个并行连接，执行360秒查询.

Simply speaking: create 10 parallel connection that execute queries for 360 seconds.

在我的Java程序中，我执行以下命令:

From my java program i execute the following command:

sshconnection.execute("nohup su - oracle -c './shortoracle.bash'",2000);

ssh成功执行脚本.

The ssh executes the script successfully.

我想在2秒钟的超时(第二个参数)之后终止ssh连接，但是为了使脚本在后台继续正常运行(因此，nohup或我认为)，这没有发生:

I want,after a timeout of 2 seconds (the second param) to terminate the ssh connection, but for the script to continue to run properly in the background (therefore the nohup, or so i thought), it's not happening:

在我终止sshconnection的2秒后，bash程序停止工作:

After 2 seconds when i terminate the sshconnection, the bash program just stops working:

• 10个连接中只有3个处于打开状态.

• Only 3 of the 10 connections are open.

没有更多的插入发生.

如果我给该连接更长的超时时间，那么一切都很好，但是我不想挂断该特定的连接，我需要继续进行该程序.

If i give the connection a longer timeout, all is going well, but i don't want to hangup on this specific connection, i need to move on with the program.

我在这里做错什么了?

推荐答案

您应在命令后添加&，即

sshconnection.execute("nohup su - oracle -c './shortoracle.bash' &",2000);

因为关闭SSH时nohup本身会断开连接 联系.使用&，您可以在后台运行"nohup"本身，因此，在关闭SSH连接后，它可以继续运行.

Since nohup itself will otherwise get disconnected when you close the SSH connection. With & you run 'nohup' itself in the background and therefore allow it to continue running after you close the SSH connection.

希望这对您有所帮助！

这篇关于ssh连接关闭后，通过Java在后台执行bash脚本的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！