Add swap space on ubuntu

• 1. Checking the System for Swap Information
• 2. Checking Available Space on the Hard Drive Partition
• 3. Creating a Swap File
• 4. Enabling the Swap File
• 5. Making the Swap File Permanent

Step 1 :Checking the System for Swap Information:

Method 1:

  
    sudo swapon --show
  

output:

  
    NAME      TYPE      SIZE USED PRIO
    /swapfile file        4G 1.7G   -2
    /dev/vda2 partition   2G   0B   -3
  

Method 1:

  
    free -h
  

output:

  
    total        used        free      shared  buff/cache   available
    Mem:          7.8Gi       4.9Gi       1.3Gi       8.0Mi       1.6Gi       2.7Gi
    Swap:         6.0Gi       1.6Gi       4.4Gi
  

Step 2 : Checking Available Space on the Hard Drive Partition

  
    df -h
  

output:

  
    Filesystem      Size  Used Avail Use% Mounted on
    udev            3.9G     0  3.9G   0% /dev
    tmpfs           797M  1.5M  795M   1% /run
    
    /dev/vda1        97G   37G   57G  40% /
    
    tmpfs           3.9G     0  3.9G   0% /dev/shm
    tmpfs           5.0M     0  5.0M   0% /run/lock
    tmpfs           3.9G     0  3.9G   0% /sys/fs/cgroup
    tmpfs           797M     0  797M   0% /run/user/0
  

Step 3 :Creating a Swap File

creates a file of the specified size

  
    sudo fallocate -l 1G /swapfile
  

check amount of space was reserved

  
    ls -lh /swapfile
  

output:

  
    -rw-r--r-- 1 root root 1.0G Apr 25 11:14 /swapfile
  

Step 4 :Enabling the Swap File

change permissions to root privileges can read

  
    sudo chmod 600 /swapfile
  

Verify the permissions change

  
    ls -lh /swapfile
  

output:

  
    -rw------- 1 root root 1.0G Apr 25 11:14 /swapfile
  

mark the file as swap space

  
    sudo mkswap /swapfile
  

output:

  
    Setting up swapspace version 1, size = 1024 MiB (1073737728 bytes)
    no label, UUID=6e965805-2ab9-450f-aed6-577e74089dbf
  

enable the swap file

  
    sudo swapon /swapfile
  

Verify that the swap is available

  
    sudo swapon --show
  

output:

  
    NAME      TYPE  SIZE USED PRIO
    /swapfile file 1024M   0B   -2
  

  
    free -h
  

output:

  
    total        used        free      shared  buff/cache   available
    Mem:          981Mi       123Mi       644Mi       0.0Ki       213Mi       714Mi
    Swap:         1.0Gi          0B       1.0Gi
  

Step 5 : Making the Swap File Permanent

Back up the /etc/fstab file in case anything goes wrong

  
    sudo cp /etc/fstab /etc/fstab.bak
  

Add the swap file information to the end of your /etc/fstab file

  
    echo '/swapfile none swap sw 0 0' | sudo tee -a /etc/fstab