Where I work we don’t have anything like Red Hat Satellite to deploy updates to our thirteen Red Hat servers. So that I don’t have to touch each server manually to apply updates in a relatively controlled fashion, I wrote some shell scripts that will connect to each server, apply updates and then ask if you want to reboot. Again, I don’t normally reboot unless there is a kernel update.
This is the script I use to update servers in our Dev/Test and non-web Production servers:
#!/bin/bash clear # SSH to the server and run local yum update echo "**** Connecting to server1 to update ****" echo ssh -t user@server1 sudo yum update -y 2>&1 | tee -a $HOME/Documents/yumlogs/Dev_Test/updates_server1_`date +%Y%m%d`.log echo echo "**** Finished updating server1 ****" echo read -p "Press [Enter] to continue" clear echo "----------------------------------------------------" echo # SSH to the server and run local yum update echo "**** Connecting to server2 to update ****" echo ssh -t user@server2 sudo yum update -y 2>&1 | tee -a $HOME/Documents/yumlogs/Dev_Test/updates_server2_`date +%Y%m%d`.log echo echo "**** Finished updating server2 ****" echo read -p "Press [Enter] to continue" clear echo "----------------------------------------------------" echo # **************** REBOOTS SECTION ******************* echo "^^^ Do you want to reboot server1? (yes/no) ^^^" read REPLY if [ "$REPLY" == "yes" ]; then echo echo "*** WARNING: You have selected to reboot server1 ***" sleep 3 # SSH to the server and run shutdown ssh -t user@server1 sudo shutdown -r +1 Rebooting in 1 minute sleep 30 elif [ "$REPLY" == "no" ]; then echo echo "--- server1 will not reboot ---" sleep 2 else echo echo "invalid answer, type yes or no"; fi sleep 2 echo echo "^^^ Do you want to reboot server2? (yes/no) ^^^" read REPLY if [ "$REPLY" == "yes" ]; then echo echo "*** WARNING: You have selected to reboot server2 ***" sleep 2 # SSH to the server and run shutdown ssh -t user@server2 sudo shutdown -r +1 Rebooting in 1 minute sleep 30 elif [ "$REPLY" == "no" ]; then echo echo "--- server2 will not reboot ---" sleep 2 else echo echo "invalid answer, type yes or no"; fi sleep 2 echo
Then I use this script to run on my web servers that are in load balancers making sure to complete updates in a controlled fashion.
#!/bin/bash # **************** THIS SCRIPT IS FOR UPDATING REMOTE SERVERS ON LOAD BALANCERS ******************* clear echo echo echo -e " ---->> \033[33;7mREMEMBER TO COMPLETE A SNAPSHOT OF THE SERVERS BEFORE PROCEEDING\033[0m <<----" echo sleep 5 read -p "Press [ENTER] to continue " echo echo "**** Please remove WEB1 from load balance rotation ****" echo sleep 5 read -p "Once the WEB1 has been removed from rotation press [Enter] to continue to complete updates " clear echo # **************** UPDATES SECTION FOR WEB1 ******************* # SSH to the server and run local yum update echo "**** Connection to WEB1 to update ****" echo ssh -t username@WEB1 sudo yum update -y 2>&1 | tee -a $HOME/updates_web1_`date +%Y%m%d`.log echo echo "**** Finished updating WEB1 ****" clear echo # **************** REBOOTS SECTION FOR WEB1 ******************* echo "^^^ Do you want to reboot WEB1? (yes/no) ^^^" read REPLY if [ "$REPLY" == "yes" ]; then echo echo "*** WARNING: You have selected to reboot WEB1 ***" sleep 3 echo # SSH to the server and run shutdown ssh -t username@WEB1 sudo shutdown -r +1 Rebooting in 1 minute sleep 30 elif [ "$REPLY" == "no" ]; then echo echo "--- WEB1 will not reboot ---" sleep 2 else echo echo "invalid answer, type yes or no"; fi echo echo "**** Please test WEB1 before moving on to the next phase ****" sleep 5 echo read -p "Once WEB1 is up after a reboot (if rebooted) and has been tested press [Enter] to continue to WEB2" echo # **************** DONE WITH REBOOTS SECTION FOR WEB1 ******************* clear echo "**** Please add WEB1 back into rotation and remove WEB2 from load balance rotation ****" echo sleep 5 read -p "Once WEB2 has been removed from rotation press [Enter] to continue to complete updates " clear echo # **************** UPDATES SECTION FOR WEB2 ******************* # SSH to the server and run local yum update echo "**** Connection to WEB2 to update ****" echo ssh -t username@WEB2 sudo yum update -y 2>&1 | tee -a $HOME/updates_104_`date +%Y%m%d`.log echo echo "**** Finished updating WEB2 ****" clear echo # **************** REBOOTS SECTION FOR WEB2 ******************* echo "^^^ Do you want to reboot WEB2? (yes/no) ^^^" read REPLY if [ "$REPLY" == "yes" ]; then echo echo "*** WARNING: You have selected to reboot WEB2 ***" sleep 3 echo # SSH to the server and run shutdown ssh -t username@WEB2 sudo shutdown -r +1 Rebooting in 1 minute sleep 30 elif [ "$REPLY" == "no" ]; then echo echo "--- WEB2 will not reboot ---" sleep 2 else echo echo "invalid answer, type yes or no"; fi echo echo "**** Please test the WEB2 before moving on to the next phase ****" sleep 5 echo read -p "Once WEB2 is up after a reboot (if rebooted) and has been tested, add WEB2 back into rotation and press [Enter] to continue " echo # **************** DONE WITH REBOOTS SECTION FOR WEB2 ******************* clear
Ordinary Man 