Zram - Revision history

Macmpi: /* Configuration */ add zramctl

2026-01-11T12:13:34Z

Configuration: add zramctl

← Older revision		Revision as of 12:13, 11 January 2026
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	Start services:{{Cmd\|# rc-service zram-init start}}		Start services:{{Cmd\|# rc-service zram-init start}}

			Check overall status: {{Cmd\|# zramctl}}

	View the ZRAM drive:{{Cmd\|# cat /proc/swaps}}		View the ZRAM drive:{{Cmd\|# cat /proc/swaps}}

Ktpss95112: add trouble shooting

2025-06-04T18:18:52Z

add trouble shooting

← Older revision		Revision as of 18:18, 4 June 2025
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	size0=8000		size0=8000
	</nowiki>}}		</nowiki>}}

			Advanced parameters can be found in the [https://github.com/vaeth/zram-init/blob/main/openrc/conf.d/zram-init source repo].

	Start services:{{Cmd\|# rc-service zram-init start}}		Start services:{{Cmd\|# rc-service zram-init start}}
Line 27:		Line 29:

	== Troubleshooting ==		== Troubleshooting ==

			Check whether ZRAM's module is loaded: {{Cmd\|# lsmod \| grep zram}}

			If not loaded, use <code>modprobe</code> to load it: (however, it should be automatically loaded if <code>load_on_start=yes</code> is in the configuration) {{Cmd\|# modprobe zram}}

	== See also ==		== See also ==

Prabuanand: updated based on https://gitlab.alpinelinux.org/alpine/aports/-/issues/17231

2025-06-04T05:58:15Z

updated based on https://gitlab.alpinelinux.org/alpine/aports/-/issues/17231

← Older revision		Revision as of 05:58, 4 June 2025
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	== Configuration ==		== Configuration ==

	For a basic ZRAM swap, configure ZRAM by editing the file {{path\|/etc/conf.d/zram-init}} as follows:{{Cat\|/etc/conf.d/zram-init\|<nowiki>num_devices=1		For a basic ZRAM swap, configure ZRAM by editing the file {{path\|/etc/conf.d/zram-init}} as follows:{{Cat\|/etc/conf.d/zram-init\|<nowiki>load_on_start=yes
	size0=8000 </nowiki>}}		unload_on_stop=yes
			num_devices=1
			type0=swap
			size0=8000
			</nowiki>}}

	Start services:{{Cmd\|# rc-service zram-init start}}		Start services:{{Cmd\|# rc-service zram-init start}}

Prabuanand: changed introduction paragraph, fixed wikitags, cleaned up categories, rephrased sentence, added links

2025-04-03T11:45:45Z

changed introduction paragraph, fixed wikitags, cleaned up categories, rephrased sentence, added links

← Older revision		Revision as of 11:45, 3 April 2025
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	This page documents how to set up [https://docs.kernel.org/admin-guide/blockdev/zram.html ZRAM] in Alpine.		This page documents how to set up [https://docs.kernel.org/admin-guide/blockdev/zram.html ZRAM] in Alpine Linux. Zram can be used as an alternative to [[Swap]] partition.

	== Installation ==		== Installation ==
	Install the neccessary packages.
	{{Cmd\|# apk add {{pkg\|zram-init}}}}		Install the neccessary packages:{{Cmd\|# apk add {{pkg\|zram-init}}}}

	== Configuration ==		== Configuration ==
	~~Make service start during next reboot.~~
	~~{{Cmd\|# rc-update add zram-init}}~~

	~~Configure~~ ZRAM ~~SWAP~~:		For a basic ZRAM swap, configure ZRAM by editing the file {{path\|/etc/conf.d/zram-init}} as follows:{{Cat\|/etc/conf.d/zram-init\|<nowiki>num_devices=1
	{{~~Cmd~~\|~~# vi~~ /etc/conf.d/zram-init}}		size0=8000 </nowiki>}}

	~~For basic ZRAM swap~~:		Start services:{{Cmd\|# rc-service zram-init start}}
	# ~~Update from num_devices=3 to num_devices=1~~
	~~# Change the size0=512 to the desired megabytes (same as available RAM or 8GB, whichever is less)~~

			View the ZRAM drive:{{Cmd\|# cat /proc/swaps}}

	~~Start services~~:		Check Algorithms:{{Cmd\|# cat /sys/block/zram0/comp_algorithm}}
	{{Cmd\|# ~~rc-service zram-init start~~}}

	~~View the ZRAM drive~~		Advanced setups may also add these parameters to {{path\|/etc/sysctl.conf}} as follows:{{Cat\|/etc/sysctl.conf\|<nowiki>vm.page-cluster=0
	{{~~Cmd~~\|~~# cat~~ /~~proc~~/~~swaps~~}}		vm.extfrag_threshold=0
			vm.swappiness=100</nowiki>}}

	~~Check Algorithms~~:		To ensure that service starts during next reboot: {{Cmd\|# rc-update add zram-init}}
	{{Cmd\|# ~~cat /sys/block/zram0/comp_algorithm~~}}

	~~Advanced setups may also add these parameters to /etc/sysctl.conf:~~
	* vm.page-cluster=0
	* vm.extfrag_threshold=0
	* vm.swappiness=100
	~~<!--~~
	~~Remove the remarks once content is added~~
	== Troubleshooting ==		== Troubleshooting ==
	~~-->~~
	== See ~~Also~~ ==		== See also ==

			* [https://github.com/vaeth/zram-init/blob/main/openrc/conf.d/zram-init sample zram-init file on official website]
	* [https://wiki.archlinux.org/title/Zram Zram in Arch Wiki]		* [https://wiki.archlinux.org/title/Zram Zram in Arch Wiki]
	* [https://en.wikipedia.org/wiki/zram Zram in Wikipedia]		* [https://en.wikipedia.org/wiki/zram Zram in Wikipedia]

	[[Category:System Administration‏‎]]		[[Category:System Administration‏‎]]
	~~[[Category:Storage‏‎‏‎]]~~
	[[Category:Storage‏‎‏‎]]		[[Category:Storage‏‎‏‎]]
	[[Category:Kernel]]		[[Category:Kernel]]
	~~[[Category:Filesystems‎]]~~

Luckyturtledev: zstd issue was fixed 5 years ago, see https://gitlab.alpinelinux.org/alpine/aports/-/issues/10044. tested it and it works fine. forgot to delete this line at the previous edit.

2025-02-09T14:48:43Z

zstd issue was fixed 5 years ago, see https://gitlab.alpinelinux.org/alpine/aports/-/issues/10044. tested it and it works fine. forgot to delete this line at the previous edit.

← Older revision		Revision as of 14:48, 9 February 2025
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	# Update from num_devices=3 to num_devices=1		# Update from num_devices=3 to num_devices=1
	# Change the size0=512 to the desired megabytes (same as available RAM or 8GB, whichever is less)		# Change the size0=512 to the desired megabytes (same as available RAM or 8GB, whichever is less)
	~~# Change the default algorithm from zstd to lzo-rle~~

Luckyturtledev: remove warning that zstd do not work. was fixed 5 years ago

2025-02-04T14:48:18Z

remove warning that zstd do not work. was fixed 5 years ago

← Older revision		Revision as of 14:48, 4 February 2025
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	# Change the default algorithm from zstd to lzo-rle		# Change the default algorithm from zstd to lzo-rle

	~~{{warning\| The default algorithm zstd does not work with Alpine Linux.[https://gitlab.alpinelinux.org/alpine/aports/-/issues/10044 10044]}}~~

	Start services:		Start services:

Prabuanand: fixed typo

2024-10-09T17:13:12Z

fixed typo

← Older revision		Revision as of 17:13, 9 October 2024
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	* vm.extfrag_threshold=0		* vm.extfrag_threshold=0
	* vm.swappiness=100		* vm.swappiness=100
			<!--
			Remove the remarks once content is added
	== Troubleshooting ==		== Troubleshooting ==
			-->
	== See Also ===		== See Also ==
	* [https://wiki.archlinux.org/title/Zram Zram in Arch Wiki]		* [https://wiki.archlinux.org/title/Zram Zram in Arch Wiki]
	* [https://en.wikipedia.org/wiki/zram Zram in Wikipedia]		* [https://en.wikipedia.org/wiki/zram Zram in Wikipedia]

Prabuanand: Based on content creatied by Bignay2000 on 15 June 2024‎ in Talk:Tutorials_and_Howtos

2024-10-09T17:11:39Z

Based on content creatied by Bignay2000 on 15 June 2024‎ in Talk:Tutorials_and_Howtos

New page

This page documents how to set up [https://docs.kernel.org/admin-guide/blockdev/zram.html ZRAM] in Alpine.

== Installation ==
Install the neccessary packages.
{{Cmd|# apk add {{pkg|zram-init}}}}

== Configuration ==
Make service start during next reboot.
{{Cmd|# rc-update add zram-init}}

Configure ZRAM SWAP:
{{Cmd|# vi /etc/conf.d/zram-init}}

For basic ZRAM swap:
# Update from num_devices=3 to num_devices=1
# Change the size0=512 to the desired megabytes (same as available RAM or 8GB, whichever is less)
# Change the default algorithm from zstd to lzo-rle

{{warning| The default algorithm zstd does not work with Alpine Linux.[https://gitlab.alpinelinux.org/alpine/aports/-/issues/10044 10044]}}

Start services:
{{Cmd|# rc-service zram-init start}}

View the ZRAM drive
{{Cmd|# cat /proc/swaps}}

Check Algorithms:
{{Cmd|# cat /sys/block/zram0/comp_algorithm}}

Advanced setups may also add these parameters to /etc/sysctl.conf:
* vm.page-cluster=0
* vm.extfrag_threshold=0
* vm.swappiness=100

== Troubleshooting ==

== See Also ===
* [https://wiki.archlinux.org/title/Zram Zram in Arch Wiki]
* [https://en.wikipedia.org/wiki/zram Zram in Wikipedia]

[[Category:System Administration‏‎]]
[[Category:Storage‏‎‏‎]]
[[Category:Storage‏‎‏‎]]
[[Category:Kernel]]
[[Category:Filesystems‎]]

← Older revision		Revision as of 12:13, 11 January 2026
Line 17:		Line 17:

	Start services:{{Cmd\|# rc-service zram-init start}}		Start services:{{Cmd\|# rc-service zram-init start}}

			Check overall status: {{Cmd\|# zramctl}}

	View the ZRAM drive:{{Cmd\|# cat /proc/swaps}}		View the ZRAM drive:{{Cmd\|# cat /proc/swaps}}