Virtual memory always full / PhPmyadmin / Logs / admin context ( and other NOOB Q )

Howdy,

1. Why is my virtual memory always on 100%

You may need to review the processes running on your server to determine what is using up your available RAM.

One option is to disable unnecessary services, and/or increase your available RAM or setup swap. This here may help with disabling some services:

https://www.virtualmin.com/documentation/system/low-memory

2. How one can go back without logging out and re-login again?

Sorry, for security reasons, there isn't a way to switch back without re-logging in. Once you select the "Login as server owner" option, you fully become that actual user. If there were a way to switch back, it could introduce security problems where domain owners could elevate their permissions.

3. Is there a way to "kick" logins

Yup, Webmin -> Webmin -> Webmin Users -> View Login Sessions, then you can select "Disconnect" for any session.

4. Do I have to install it ( or enable it ) for each one of the servers ( domains) in "Install Scripts" menu item?

No domains or web apps are installed by default. Anytime you add a domain, if you want phpMyAdmin or RoundCube, you'd need to go into Install Scripts, and then install any web apps you want associated with that domain.

-Eric

Would be interested in your writeup of the troubleshooting for this. I have a sever doing this too. Mine is a 1 cpu 2 GB Ram VPS, and it takes about 3 days to shit itself. I know my problem is somewhere in apache but not sure where. An apache restart after even 2 days drops ram usage by 20%.

I thought about changing to nginx...my limited nginx experience and the htaccess issue scares me away from it though.

1. Your virtual mem is only 256mb. It should be the same or larger than your actual memory. At 36hrs, only 178mb virtual mem is used. Which is nothing. But the percent looks high because the max is lower than normal.
2. Linux, no matter whats running, will tend to cache stuff in memory forever until something more important needs the memory space. So 30,40,50% memory use for an idle server is not unusual.
3. Linux tends to cache things up to about 50% of the memory. So nothing to worry about Even 80% or more mem used is ok, which will actually still be 50% cache and 30% live use. Just increase your swap to 1x or 2x the memory. Then Just watch the swap, if its regularly 50% or higher, then start worrying about adding memory.

Sorry, thought I was clear. No where did I say using all of virtual memory is normal or good. In my post I was specific about memory and virtual memory. Linux will use up to 50% of the MEMORY even on an idle system as it retains stuff in MEMORY as cache. With use, MEMORY will start getting fuller and will send stuff more regularly to VIRTUAL MEMORY if needed.(aka swap). High swap use is never good and will lead slow downs and eventually lock ups. But in your case, your total swap is set to low anyway so the gauge is not ideal. Set it to 1g and see what percent says then. Ideally you don't want it to use any VIRTUAL MEMORY at all. Virtual memory is strictly there to act as a buffer during spikes when system memory needs more space. If you're constantly filling up VIRTUAL MEMORY, then you need to add more physical MEMORY.

Adding swap is done via terminal or prior to creating the virtual server. Actually it can be done in webmin > Hardware.... > partitions and disks. IF you have a partition that's not in use. But you can not carve out space from a running partition. Can only add another swap partition if an empty partition already exists and i not in use. You can however add a swap file live with the commands you mentioned but the additional swap wont survive a reboot unless you also put the info in the /etc/fstab file.