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

hi friends I am Brijesh singh and I am Linux system administration,I can solve your linux problem please and qmail and ldap related problem.please update your own linux problem and you have any please share with me.

Allowing ssh login using Sudo

Allowing ssh login using Sudo In order to record all the commands executed by a engineer when doing a remote login via ssh to your server do the following: 1. Login to the Linux server using the root login. 2. Edit the /etc/sudoers file using visudo. After editing the contents of the file shoud be as follows: # sudoers file. # # This file MUST be edited with the 'visudo' command as root. # # See the sudoers man page for the details on how to write a sudoers file. # # Host alias specification # User alias specification # Cmnd alias specification Cmnd_Alias USR_BIN_CMDS = /usr/bin/telnet, /usr/bin/tail, /usr/bin/diff, /usr/bin/dig, /usr/bin/find, \ /usr/bin/head, /usr/bin/kill, /usr/bin/ldapsearch, /usr/bin/man, \ /usr/bin/updatedb, /usr/bin/wget, /usr/bin/du, /usr/bin/watch Cmnd_Alias SBIN_CMDS = /sbin/chkconfig, /sbin/fdisk, /sbin/fsck, /sbin/ifconfig Cmnd_Alias USR_SBIN_CMDS = /usr/sbin/crond Cmnd_Alias USR_LIB_CMDS = /usr/lib/rpm...

BK Technophile

Search This Blog