How to increase Swap space on Running system without Downtime

If you want incrase 2 GB of swap then follow below Steps

dd if=/dev/zero of=/swapfile bs=1024 count=2097152

#mkswap /swapfile

#swapon /swapfile

#swapon -s

check the swap file

#cat /proc/swaps

If you want parmanent then add line in fstab file

#vi /etc/fstab
/swapfile none swap sw 0 0

save the file and check with free commands

#free

Comments

fatal: scan_dir_push: open directory defer: Permission denied

problem:- Nov 7 18:24:18 linuxxf postfix-archive/postsuper[20555]: fatal: scan_dir_push: open directory defer: Permission denied Nov 7 18:24:19 linuxxf postfix-archive/postfix-script: fatal: Postfix integrity check failed! Nov 7 18:28:26 linuxxf postfix-archive/postsuper[21162]: fatal: scan_dir_push: open directory defer: Permission denied Nov 7 18:29:57 linuxxf postfix-archive/postsuper[21334]: fatal: scan_dir_push: open directory defer: Permission denied soloution:- To correct queues that were created outside of Postfix: postfix -c /etc/postfix-archive set-permissions

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