bash - 无法完全关闭脚本导出中的远程SSH隧道

Question

我正在编写一个脚本，该脚本从我们远程部署的VM双击SSH转发端口80，并在本地浏览器中打开此“状态页面”。要打开它，SSH隧道必须是“后台”的，但是这样做会导致SSH隧道退出，而我正在通过的SSH服务器(bastion)上保留了一个永久隧道。到目前为止，这是脚本:

#!/bin/sh
# SSH needs a HUP when this script exits
shopt -s huponexit

echo "SSH Forwards the VM status page for a given host..."
read -p "Host Name: " CODE
PORT=$(($RANDOM + 1024))

# "-t -t" (force tty) needed to avoid orphan tunnels on bastion after exit. (Only seems to work when not backgrounded?)
ssh -t -t -4L $PORT:localhost:$PORT user1@bastion sudo ssh -4NL $PORT:localhost:80 root@$CODE.internal-vms &
PID=$!

# Open browser to VM Status Page
sleep 1
open http://localhost:$PORT/

# Runs the SSH tunnel in the background, ensuring it gets killed on shell's exit...
bash

kill -CONT $PID
#kill -QUIT $PID
echo "Killed SSH Tunnel. Exiting..."
sleep 2

不幸的是，给定SSH隧道的背景(在第10行上使用&)，当脚本被杀死(通过CTRL-C)时，“堡垒”服务器最终会无限期地保留孤立的SSH连接。

我尝试过的“-t -t”和“shopt -s huponexit”是固定的，但似乎无济于事。我还在最终的kill中尝试了各种SIG。我在这里做错了什么？感谢您的协助!

Answer 1

-f标志可用于后台处理。要终止连接，与暴力比较严重的ssh -O exit user1@bastion相比，kill是更好的选择。

我会这样做。 Fyi，尽管我经常使用类似的长SSH命令，但我没有测试修改后的脚本。

#!/bin/sh
# SSH needs a HUP when this script exits
shopt -s huponexit

echo "SSH Forwards the VM status page for a given host..."
read -p "Host Name: " CODE
PORT=$(($RANDOM + 1024))

# "-t -t" (force tty) needed to avoid orphan tunnels on bastion after exit. (Only seems to work when not backgrounded?)
ssh -t -t -f -4L $PORT:localhost:$PORT user1@bastion sudo ssh -4NL $PORT:localhost:80 root@$CODE.internal-vms
#PID=$!

# Open browser to VM Status Page
sleep 1
open http://localhost:$PORT/

# Runs the SSH tunnel in the background, ensuring it gets killed on shell's exit...
#bash

#kill -CONT $PID
#kill -QUIT $PID
ssh -O exit user@bastion

echo "Killed SSH Tunnel. Exiting..."
sleep 2