How to extend swap space in Linux
Sometime you will need to increase space fo swap space in Linux – and for that isn’t needed to add new disk or to restart server – if you have enought free space on current environment you can use some amount of that server for extendinx swap. In this tutorial we will use variables for easier (copy-paste) usage and here we will extend swap for 2GB
# Variable - Where you want to be placed new swap file SWAP_FILE="/mnt/SWAP/swapfile01.img" # Making a directory for new swap file mkdir -p `dirname ${SWAP_FILE}` # Check - how much space we have in that location df -h `dirname ${SWAP_FILE}` # Check - is there already created file with same name # if - exists it will be destroyed. Please use some other name # or location in first variable and start again [ -f ${SWAP_FILE} ] && echo "File exists, CHANGE NAME in first step" || echo "Everything is OK, you can continue.." # Variable: For how many GB you want to expand current swap (in this case for 8GB) SWAP_IN_GB=8 dd if=/dev/zero of=${SWAP_FILE} bs=1024 count=${SWAP_IN_GB}M chmod 0600 ${SWAP_FILE} # Making od swap system inside created file mkswap ${SWAP_FILE} # Adding new swap space in /etc/fsttab (to be mounted with boot process) cp /etc/fstab ~/`date +%Y%m%d`_backup_fstab #backup echo "${SWAP_FILE} swap swap sw 0 0" >> /etc/fstab mount -a # Check - is there any error while mounting from fstab # Activating of new swap file swapon ${SWAP_FILE} # Check new swap space - is it increased for ${SWAP_IN_GB} GB grep Swap /proc/meminfo