Create swap

swap

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+1. Create a linuxacademy.com lab server and mount a disk.
+
+
+
+2. The linuxacademy.com lab servers already have swap enabled so first run swapoff to disable the /swapfile in the /etc/fstab file.
+
+[root@localhost etc]# swapoff -a
+
+
+
+Note: swapoff -a will disable the swap space listed in /etc/fstab
+
+3. Remove the entry /swapfile from the /etc/fstab file.
+
+[root@localhost etc# vim fstab
+
+#
+
+# /etc/fstab
+
+# Created by anaconda on Fri Oct 17 18:33:48 2014
+
+#
+
+# Accessible filesystems, by reference, are maintained under '/dev/disk'
+
+# See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info
+
+#
+
+UUID=668dbd02-c201-44bc-be76-f606fc9ab8db /                       xfs     defaults        1 1
+
+4. Verify there is no current swap space available
+
+[root@localhost etc]# free -m
+
+             total       used       free     shared    buffers     cached
+
+Mem:           992        225        767         12          1         82
+
+-/+ buffers/cache:        141        851
+
+Swap:            0          0          0
+
+ 5. Using fdisk create a partition that uses the entire /dev/xvdf disk and make sure to label the device correctly.
+
+[root@localhost dev]# fdisk xvdf
+
+Welcome to fdisk (util-linux 2.23.2).
+
+
+
+Changes will remain in memory only, until you decide to write them.
+
+Be careful before using the write command.
+
+
+
+Device does not contain a recognized partition table
+
+Building a new DOS disklabel with disk identifier 0x69baf224.
+
+
+
+Command (m for help): n
+
+Partition type:
+
+   p   primary (0 primary, 0 extended, 4 free)
+
+   e   extended
+
+Select (default p): 
+
+Using default response p
+
+Partition number (1-4, default 1): 
+
+First sector (2048-2097151, default 2048): 
+
+Using default value 2048
+
+Last sector, +sectors or +size{K,M,G} (2048-2097151, default 2097151): 
+
+Using default value 2097151
+
+Partition 1 of type Linux and of size 1023 MiB is set
+
+
+
+Command (m for help): t
+
+Selected partition 1
+
+Hex code (type L to list all codes): 82
+
+Changed type of partition 'Linux' to 'Linux swap / Solaris'
+
+
+
+Command (m for help): w
+
+The partition table has been altered!
+
+
+
+Calling ioctl() to re-read partition table.
+
+Syncing disks.
+
+[root@localhost dev]# 
+
+6. Format the device with the swap signature.
+
+[root@localhost dev]# mkswap /dev/xvdf1
+
+Setting up swapspace version 1, size = 1047548 KiB
+
+no label, UUID=5713eae2-de6b-4485-af5d-1c659765cd92
+
+7. Activate the swap space.
+
+[root@localhost dev]# swapon /dev/xvdf1
+
+[root@localhost dev]# free -m
+
+             total       used       free     shared    buffers     cached
+
+Mem:           992        216        776         12          0         79
+
+-/+ buffers/cache:        135        857
+
+Swap:         3046          0       3046
+
+
+
+8. Add swap space to the /etc/fstab so that it is a persistent mount.
+
+[root@localhost dev]# blkid
+
+/dev/xvda2: UUID="" TYPE="xfs" PARTUUID="9146b810-9a31-4c10-a206-01b0bbaca807" 
+
+/dev/xvdf1: UUID="" TYPE="swap" 
+
+Grab the UUID to mount the swap device.
+
+[root@localhost dev]# vim /etc/fstab
+
+#
+
+# /etc/fstab
+
+#
+
+UUID=668dbd02-c201-44bc-be76-f606fc9ab8db /                       xfs     defaults        1 1
+
+UUID=YOUR-UUID swap  swap    defaults 0 0 
+
+9. Activate the swap space that is added in the /etc/fstab file.
+
+Since we activated it manually already let's manually deactivate it then activate it based on the /etc/fstab file.
+
+[root@localhost dev]# swapoff /dev/xvdf1
+
+Now activate it persistently based off the /etc/fstab entry.
+
+[root@localhost dev]# swapon -a
+
+-a will activate all swap spaces located in the /etc/fstab