Install RAM requirement for Alma/Rocky 8/9

You could switch to Hetzner or another cheaper host.

 

My smallest VPS is 2GB RAM and 2CPU so you should be good with something smaller.

I don't think 1GB would work anymore like with centos 7.

 

Recommended is 4GB but minimum is 2GB, i have been successfully running a 2GB VPS for testing purposes but recently come up against this, seems i am a few MBs short

Code:

                          
Warning: physically installed memory and swap too low for Centmin Mod
Installation [Installed: 1674 MB < 1689 MB memory and 3686 MB < 3686 MB swap (recommended minimum)]

aborting install...

I am tied in to contract on a couple 2GB VPS so hopefully there is a simple way to circumvent this and allow installation ?

 

Thanks @eva2000 this is just what i needed

I used

Code (Text):

mkdir /etc/centminmod
nano /etc/centminmod/custom_config.inc

and added

Code (Text):

ISMINMEM_OVERRIDE='y'

when installing CMM i got the exact same error as listed above

Code (Text):

Installation [Installed: 1674 MB < 1689 MB memory and 3686 MB < 3686 MB swap (recommended minimum)]

aborting install...

i got around this by removing the single quotes each side of the 'y' so the contents of the custom_config.inc now reads

Code (Text):

ISMINMEM_OVERRIDE=y

Now when runnign CMM installer it proceeds ok and memory output reads

Code (Text):

Ok: swap is sufficient for Centmin Mod installation despite low memory
Installation [Installed: 1674 MB < 1689 MB memory, but 4194300 MB >= 3686 MB swap]

I dont fully understand why this fails and then works but i have had it fail multiple times with 'y' and then install multiple times once edited ?

just wanted to post some feedback in case it helps anyone else trying to install on 2GB machine

 

Im installing on alma9 and use MobaXterm for SSH

Code (Text):

[root@localhost ~]# mkdir -p /etc/centminmod
[root@localhost ~]# touch /etc/centminmod/custom_config.inc
[root@localhost ~]# echo "ISMINMEM_OVERRIDE='y'" >> /etc/centminmod/custom_config.inc
[root@localhost ~]# echo "ISMINSWAP_OVERRIDE='y'" >> /etc/centminmod/custom_config.inc
[root@localhost ~]# curl -O https://centminmod.com/installer83.sh && chmod 0700 installer83.sh && bash installer83.sh
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100  109k    0  109k    0     0   162k      0 --:--:-- --:--:-- --:--:--  162k
Last metadata expiration check: 8:54:55 ago on Sun 13 Jul 2025 12:52:47 AM UTC.
Package glibc-langpack-en-2.34-168.el9_6.20.x86_64 is already installed.
Dependencies resolved.
Nothing to do.
Complete!

Installed:
  bc-1.07.1-14.el9.x86_64


               total        used        free      shared  buff/cache   available
Mem:            1674         418        1083           8         331        1255
Swap:              0           0           0

create 4GB swap file
1048576+0 records in
1048576+0 records out
4294967296 bytes (4.3 GB, 4.0 GiB) copied, 8.05385 s, 533 MB/s
-rw-r--r--. 1 root root 4.0G Jul 13 09:47 /swapfile
mkswap: /swapfile: insecure permissions 0644, fix with: chmod 0600 /swapfile
Setting up swapspace version 1, size = 4 GiB (4294963200 bytes)
no label, UUID=e9751bea-9b60-4e99-a620-41eed02c4ae4
swapon: /swapfile: insecure permissions 0644, 0600 suggested.
Filename                                Type            Size            Used           Priority
/swapfile                               file            4194300         0              -2
               total        used        free      shared  buff/cache   available
Mem:            1674         353          95           8        1388        1320
Swap:           4095           0        4095


For EL8 and EL9 operating system the minimum and recommended memory requirements have increased
Minimum: 2GB memory with 4GB swap disk
Recommended: 4GB memory with 4GB swap disk
Warning: physically installed memory and swap too low for Centmin Mod
Installation [Installed: 1674 MB < 1689 MB memory and 3686 MB < 3686 MB swap (recommended minimum)]

aborting install...

then i delete custom_config and try again without the single quotes and it runs ???

Code (Text):

[root@localhost ~]# touch /etc/centminmod/custom_config.inc
[root@localhost ~]# echo "ISMINMEM_OVERRIDE=y" >> /etc/centminmod/custom_config.inc
[root@localhost ~]# echo "ISMINSWAP_OVERRIDE=y" >> /etc/centminmod/custom_config.inc
[root@localhost ~]# curl -O https://centminmod.com/installer83.sh && chmod 0700 installer83.sh && bash installer83.sh
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100  109k    0  109k    0     0   635k      0 --:--:-- --:--:-- --:--:--  635k
Last metadata expiration check: 8:58:42 ago on Sun 13 Jul 2025 12:52:47 AM UTC.
Package glibc-langpack-en-2.34-168.el9_6.20.x86_64 is already installed.
Dependencies resolved.
Nothing to do.
Complete!

               total        used        free      shared  buff/cache   available
Mem:            1674         389         126           8        1320        1285
Low:            1674        1547         126
High:              0           0           0
Swap:           4095           0        4095
Total:          5770         389        4222

re-create 4GB swap file
1048576+0 records in
1048576+0 records out
4294967296 bytes (4.3 GB, 4.0 GiB) copied, 8.01918 s, 536 MB/s
-rw-------. 1 root root 4.0G Jul 13 09:51 /swapfile

mkswap: /swapfile contains holes or other unsupported extents.
        This swap file can be rejected by kernel on swap activation!
        Use --verbose for more details.

Setting up swapspace version 1, size = 4 GiB (4294963200 bytes)
no label, UUID=8ebb0a24-129b-4230-a149-5c44d78a09e9
Filename                                Type            Size            Used           Priority
/swapfile                               file            4194300         0              -2
               total        used        free      shared  buff/cache   available
Mem:            1674         356          93           8        1386        1317
Low:            1674        1580          93
High:              0           0           0
Swap:           4095           0        4095
Total:          5770         356        4189


Ok: swap is sufficient for Centmin Mod installation despite low memory
Installation [Installed: 1674 MB < 1689 MB memory, but 4194300 MB >= 3686 MB swap]

suspected the editor so went to putty on windows instead and got the exact same failure on a fresh image ?
It works so i dont need a solution just finding it all very strange !

 

I'm using it in multiple alma8 servers with 1GB in production sites and its running great. Ofc it depends of your site but mine are basic php+mysql without any fancy techs. You just have to manually disable memchecks from CMM installer before you run it

Here are some stats from one of my (1core/1GB ram/20gb ssd) box with sites that have tens of simultaneous users

 

1GB works fine with alma8+CMM but you have to tweak cmm installer to get it working. Now whats harder is 10GB disk, I have couple centos7 boxes with 1GB ram and 10GB disk running fine but I'm unable to get those reinstalled with alma8 + cmm because disk is too small. I still have plans to get it work somehow when I have time

 

yep those are slow but being a cheapskate I dont mind waiting since luckily you dont see those updates often

still waiting for a param insane_admin=y which would disable all kind of checks in installer so you could try exotic serverconfigs like 512mb ram and 1tb disk