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With this loop we sequential update on all servers (server list = consul members | grep awk {'print $2'} | cut -d ":" -f1) the package consul.

for i in $(consul members | grep awk {'print $2'} | cut -d ":" -f1) ; do sshpass -p $PASSWORD ssh -oStrictHostKeyChecking=no -q root@$i "hostname && yum clean all && yum -y update consul && systemctl restart consul.service" ; done

We have over 1000 servers, so we wish to run the sshpass in parallel on 10 servers. I found GNU Parallel for this task.

Howo use it with sshpass and make sure no server (server list) is done twice?

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3 Answers 3

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Indeed, pssh sounds like the better solution. If you must use parallel it should be fairly simple: pipe the hostnames one per line into a single command that uses {} as a placehold. Eg:

consul members | ... awk {'print $2'} | cut -d ":" -f1 |
parallel -j 10 sshpass -p "$PASSWORD" ssh -oStrictHostKeyChecking=no -q root@{} "hostname && yum clean all && yum -y update consul && systemctl restart consul.service"

Using sshpass should not make any difference. Test it first with a simple command such as just hostname.

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Use pssh with ssh host key authentication it's better

first, on the local box, as the user to connect with, do ssh-keygen to create a public key

then use ssh-copy-id to copy that public key to all the remote servers. then do sometinhg like:

pssh -h <(consul members | grep awk {'print $2'} | cut -d ":" -f1) -o /tmp/update-consul-servers -i "yum clean all && yum -y update consul && systemctl restart consul.service"
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All, this is the working shell that prompt password in the script, do the require command and list which server is not authenticated.

for i in cat /root/fahmi/up.list ;
do if ! sshpass -p 'password' ssh -n -T -o StrictHostKeyChecking=no user@"$i"; then echo "Server $i not accessible"; fi sshpass -p 'password' ssh -T -o StrictHostKeyChecking=no user@"$i" <./command.sh

done

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  • please fix formatting Commented Oct 22, 2018 at 4:55

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