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I'm running the script below on a gcp debian instance. When shutting down my computer, ssh disconnects, and the script stops. Below is my script:
wget -P/root -N --no-check-certificate "https://raw.githubusercontent.com/reeceyng/v2ray-agent/master/shell/install_en.sh" && mv /root/install_en.sh /root/install.sh && chmod 700 /root/install.sh &&/root/install.sh
I have tried Tmux and screen to prevent this based on other posts suggestions. None of them were helpful. All processes stop after some time.
Use nohup to detach your process (here, wget) from your shell. For example:
nohup wget -P/root -N --no-check-certificate "https://raw.githubusercontent.com/reeceyng/v2ray-agent/master/shell/install_en.sh" && mv /root/install_en.sh /root/install.sh && chmod 700 /root/install.sh &&/root/install.sh &
should do the trick.
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The following command gives the expected result (file is created):
sshpass -p pas ssh root#host 'touch foo'
But the following one does nothing on the remote host:
sudo sshpass -p pas ssh root#host 'touch foo'
The only difference here is just sudo mode.
What is the reason here? And how this can be solved?
The problem is more visible when running ssh -v.
With sudo communication interrupts after detecting the server host key.
To solve the problem ssh needs to run with the following argument -o "StrictHostKeyChecking no".
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I am trying to schedule node server restart on OS reboot (Ubuntu 16.04 LTS). I wrote:
crontab -u username -e
then I added following line:
#reboot /usr/local/bin/forever start -c /usr/bin/node /home/username/node/bin/www
I get the success message after saving or updating this file. There seems to be no effect on server reboot.
I'd wrap that into a bash script in the user's home directory's bin.
/home/username/bin/start_my_node_app.sh
Then in your crontab...
#reboot /home/username/bin/start_my_node_app.sh >/dev/null 2>&1
Though according to this article, #reboot may not work for non-root users.
https://unix.stackexchange.com/questions/109804/crontabs-reboot-only-works-for-root
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I'm planning on making a Bash script that sets up an SSH server. The script is only meant to work on a computer running OS X. With the research I have conducted it seems like you have to use the GUI to enable SSH. Is their a way to enable SSH through Terminal and then create a script that does so?
You can enable it from the command line (or a shell script) with:
sudo launchctl load -w /System/Library/LaunchDaemons/ssh.plist
You might also want to regulate access to the ssh service with the com.apple.access_ssh group:
sudo dseditgroup -o edit -a usernametoallow -t user com.apple.access_ssh
sudo dseditgroup -o edit -a otherusernametoallow -t user com.apple.access_ssh
sudo dseditgroup -o edit -a groupnametoallow -t group com.apple.access_ssh
...after which only usernametoallow, otherusernametoallow, and members of groupnametoallow will be able to ssh into the Mac.
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I´ve written a simple bash Script to reboot and update my Ubuntu 12.04 server automatically via crontab.
Here is my script:
#!/bin/bash
sudo reboot
/usr/bin/apt-get -qy update > /dev/null
/usr/bin/apt-get -qy dist-upgrade > /dev/null
exit 0
The update section doesn´t work. The server only restarts.
Can someone help me?
The script calls reboot first which halts execution so the update, upgrade is never called. If you want to reboot put it at the end of the script.
Piping the outputs to /dev/null is also a bad idea in case something goes wrong.
Better use something like this:
unattended-upgrades
It can notify you of the updates and problems and can also be configured to only perform security updates automatically
You can use cron's special word #reboot to run script after reboot. Edit your crontab with crontab -e to add:
#reboot apt-get --quiet --yes update > /dev/null && apt-get --quiet --yes dist-upgrade > /dev/null
# or
#reboot update-after-reboot.bash
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I am having multiple ssh commands to do some tasks for me. For eg:
ssh a-vm "rm -f /home/dir/file1.xlsx"
ssh a-vm "rm -f /home/dir/file2.xml"
scp me#b-vm:/somedir/file1.xlsx .
scp me#b-vm:/somedir/file2.xml .
1) Is there a way to combine 2 ssh commands into 1 and two scp commands into 1?
2) Is there a cost if I do ssh and scp multiple times instead of 1 time?
Any help is appreciated.
You can just do:
ssh a-vm "rm -f /home/dir/file1.xlsx ; rm -f /home/dir/file2.xml"
scp "me#b-vm:/somedir/{file1.xlsx,file2.xml}" .
Each ssh/scp call will cost you the connection time and some cpu time (could be significant if you do that to hundreds of machines at the same time, otherwise unlikely).
Alternatively you can use a persistent master connection for ssh and tunnel others over it. That will save a couple of network roundtrips - see http://en.wikibooks.org/wiki/OpenSSH/Cookbook/Multiplexing