How do you disconnect an OpenVPN tunnel on CentOS 7?

sn

I established a tunnel using the command "openvpn --config xyz.ovpn" but I couldn't figure out a way to disconnect the tunnel without rebooting the server. What command would you use to disconnect it on CentOS 7?

StrongBad

@sn said in How do you disconnect an OpenVPN tunnel on CentOS 7?:

@StrongBad I attempted to add the following line to the .bashrc

alias openvpn-disconnect='kill -9 $( ps -e | grep openvpn | grep -v grep | awk '{ print $1 }' )'

When sourced the .bashrc file, I received the following errors.

-bash: alias: print: not found
-bash: alias: } not found

That's because you messed up your quotes. Look at them, you have this:

kill -9 $( ps -e | grep openvpn | grep -v grep | awk

Then you have this:

{ print $1 }

Fix your quotes and it will likely work fine. If it doesn't run in a normal command line, it won't work in an alias command.

thwr

@sn said in How do you disconnect an OpenVPN tunnel on CentOS 7?:

I established a tunnel using the command "openvpn --config xyz.ovpn" but I couldn't figure out a way to disconnect the tunnel without rebooting the server. What command would you use to disconnect it on CentOS 7?

kill -9 $( ps -e | grep openvpn | grep -v grep | awk '{ print $1 }' )

http://www.commandlinefu.com/commands/using/kill

travisdh1

@sn What is the virtual adapter called that openvpn is using for it's connection?

ifdown virbr0

sn

@thwr That was the perfect answer I was looking for! Thank you.

One more question,
I tried to create an alias for that command but it gave me a "-bash: alias: print: not found" error.
I tried to replace awk '{ print $1 }' with cut -d' ' -f1 but still got similar error.
Adding the command to a bash script also did not work.

Am I doing anything wrong here or is there a better way to shorten the command?

StrongBad

@sn said in How do you disconnect an OpenVPN tunnel on CentOS 7?:

@thwr That was the perfect answer I was looking for! Thank you.

One more question,
I tried to create an alias for that command but it gave me a "-bash: alias: print: not found" error.
I tried to replace awk '{ print $1 }' with cut -d' ' -f1 but still got similar error.
Adding the command to a bash script also did not work.

Am I doing anything wrong here or is there a better way to shorten the command?

What was the alias command that you attempted?

thwr

@sn said in How do you disconnect an OpenVPN tunnel on CentOS 7?:

@thwr That was the perfect answer I was looking for! Thank you.

One more question,
I tried to create an alias for that command but it gave me a "-bash: alias: print: not found" error.
I tried to replace awk '{ print $1 }' with cut -d' ' -f1 but still got similar error.
Adding the command to a bash script also did not work.

Am I doing anything wrong here or is there a better way to shorten the command?

Sure, np. Stopping an OpenVPN tunnel is basically just stopping the process. Signal 9 may be a bit hard, try lower levels to let it gracefully stop.

About the alias: see @StrongBad's answer

sn

@StrongBad I attempted to add the following line to the .bashrc

alias openvpn-disconnect='kill -9 $( ps -e | grep openvpn | grep -v grep | awk '{ print $1 }' )'

When sourced the .bashrc file, I received the following errors.

-bash: alias: print: not found
-bash: alias: } not found

StrongBad

@sn said in How do you disconnect an OpenVPN tunnel on CentOS 7?:

@StrongBad I attempted to add the following line to the .bashrc

alias openvpn-disconnect='kill -9 $( ps -e | grep openvpn | grep -v grep | awk '{ print $1 }' )'

When sourced the .bashrc file, I received the following errors.

-bash: alias: print: not found
-bash: alias: } not found

That's because you messed up your quotes. Look at them, you have this:

kill -9 $( ps -e | grep openvpn | grep -v grep | awk

Then you have this:

{ print $1 }

Fix your quotes and it will likely work fine. If it doesn't run in a normal command line, it won't work in an alias command.

sn

@StrongBad said in How do you disconnect an OpenVPN tunnel on CentOS 7?:

@sn said in How do you disconnect an OpenVPN tunnel on CentOS 7?:

@StrongBad I attempted to add the following line to the .bashrc

alias openvpn-disconnect='kill -9 $( ps -e | grep openvpn | grep -v grep | awk '{ print $1 }' )'

When sourced the .bashrc file, I received the following errors.

-bash: alias: print: not found
-bash: alias: } not found

That's because you messed up your quotes. Look at them, you have this:
kill -9 $( ps -e | grep openvpn | grep -v grep | awk
Then you have this:
{ print $1 }
Fix your quotes and it will likely work fine. If it doesn't run in a normal command line, it won't work in an alias command.

It does run in a normal command line without changing the quotes!

StrongBad

@sn are you sure? The quotes are definitely wrong. How do you run it normally? You put quotes around the whole thing?

StrongBad

So you are running it like this...

openvpn-disconnect='kill -9 $( ps -e | grep openvpn | grep -v grep | awk '{ print $1 }' )'

ANd the value of the variable is what you want?

sn

@StrongBad Thank you!, I fixed the quote and my alias is now working!!

Now let me explain.

As you suggested, it was absolutely related to the messy quotes I was using. I changed the outer one to double quotes as below and the alias worked immediately.

alias openvpn-disconnect="kill -9 $( ps -e | grep openvpn | grep -v grep | awk '{ print $1 }' )"

When I said it was working in a normal command line, I was just entering the command without the outer quotes which means there was only one set of quote ( around { print $1} ) and hence it worked without any issues.

@thwr Thank you again for "killer" command!

StrongBad

@sn NP.

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