Email troubles

@florian030 THAT WAS IT. SEND AND RECEIVE NOW WORKING.
But why was I having this problem to begin with? Maybe it was because I previously had followed this guide to save RAM? https://www.faqforge.com/linux/cont...ilter-and-antivirus-functions-in-ispconfig-3/

 

Hey brother, please tell me how to set that cron to "clear the ram" you speak of. I'm rather new here. I'm going to need that cron. @Cris Kolkman

 

I created the file cacheclear.sh in /home

root@***:~# ls -l /home/
total 8
-rwxr-xr-x 1 root root 64 Nov 30 11:33 cacheclear.sh
And made it executable.

The content of cacheclear.sh:
#!/bin/sh
sudo sh -c "sync; echo 3 > /proc/sys/vm/drop_caches"

And put this in crontab -e
0 * * * * /home/cacheclear.sh


Don't know if it's usefull on a 1GB ram server since the processes running on the server will use all the ram and not cache much.

Code:

root@***:~# free -m
             total       used       free     shared    buffers     cached
Mem:          3965       1582       2383        108         19        493
-/+ buffers/cache:       1069       2896
Swap:         6257          0       6257

 

It's worth a try. I am sorry, but this is my first week of command line linux system administration, so... baby steps. Okay, I have a file open with nano cacheclear.sh, now do I change the root@** part of the script to mydomain.com ? And how do I "make it executable?"

 

No you don't have to do anything with the root@***

Just follow these steps:

nano /home/cacheclear.sh

Put this in the file:
#!/bin/sh
sudo sh -c "sync; echo 3 > /proc/sys/vm/drop_caches"

Save and close the file.

chmod +x /home/cacheclear.sh

And then add this line to crontab -e
0 * * * * /home/cacheclear.sh

 

Oh, Okay I was way off.
Got it.
Does it matter if I add it to the bottom or the top of crontab -e?

So, Here is my crontab -e

Code:

* * * * * /usr/local/ispconfig/server/server.sh 2>&1 | while read line; do echo `/bin/date` "$line" >> /var/log/ispconfig/cron.log; done
* * * * * /usr/local/ispconfig/server/cron.sh 2>&1 | while read line; do echo `/bin/date` "$line" >> /var/log/ispconfig/cron.log; done
0 * * * * /home/cacheclear.sh

and here is my cacheclear.sh (located in home folder)

Code:

#!/bin/sh
sudo sh -c "sync; echo 3 > /proc/sys/vm/drop_caches"

How do I test to make sure it's working?

 

sudo sh cacheclear.sh
sh: /proc/sys/vm/drop_caches: Permission denied

 

What does this command tell you:

ls -l /proc/sys/vm/drop_caches

 

-rw-r--r-- 1 root root 0 Mar 5 03:47 /proc/sys/vm/drop_caches

 

You are running that command as user root or different user?

 

I am root. It appears an OpenVZ issue. See:
http://unix.stackexchange.com/quest...-sys-vm-drop-caches-permission-denied-as-root

(I am debian 8 on OpenVz)
Any ideas?

 

I actually have 2 other VPS with 2.5 GB RAM, I may have to start all over, over on those ones I must ask, is it bad, to use all my ram around 90-100% ? My VSWAP is still in the green. Will my host get mad?

 

Like they say it's because of the OpenVz server and you are simply not allowed to clear the server ram cache.
My server is also a virtual server but I'm allowed to run the command.
There seems to be no other way to clear the cache then that command, like they say in the replies.

 

Got it. We tried. What do you think about my other questions right after that? And from there, I will leave you alone. Thank you for all of your help.

 

z

I can't imagine they will get angry if you use all your ram.
Using the 2.5GB server is probably better but don't forget that you probably delay the problem because it will keep using ram till it's at 100% (my experience though).
If I don't run the cacheclear.sh on my 4GB server it will also go to 100% because of the cache.

 

May I ask approximately how long until it reaches 100% on your 4GB server? And how often do you run a cache clear? Is this everyone's experience? Is this a debian issue, or ISPconfig issue? And is this standard practice for ISPCONFIG users? This seems like a huge problem to me, is it not? My only solution is to make my server have to restart itself every so often? Is it a memory leak, a misconfiguration, or another issue?

Looking for solutions...
Thanks again. @florian030 @Cris Kolkman

 

@wshakes can't really remember how long it takes before mine goes to 100%, but running the cronjob for clearing the cache every hour so the cache stays clear
Don't think you can really call this a "problem" because using ram cache is quite normal for every machine, only on machines with low ram it's being an issue because it stops working properly.

 

I thought the whole point of debian was you don't have to restart your server for only about once every 3 years I just don't get it!

 

Ok, for anyone who is a newbie like me who reads this someday,
I found out some things.

So clearing cache appears unimportant. On top of that, this website helped me to understand what is really going on, http://www.linuxatemyram.com/
And https://www.howtoforge.com/community/threads/how-much-of-ram-consumed-ispconfig-3.58136/ This link explains that Ispconfig actually uses very little ram at all.
Thank you all to your help. I am going to let my server run hard without a restart for a few days at least and see what happens.

 

I don't really know about that, what I do know is that running a 1GB ram server with so many functions is probably not the best solution.