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Oct
20
comment Emails stopped being sent by server all of a sudden
And what email server are you using currently?
Oct
9
comment Apache Tuning doubts
Your MaxClients is ridiculously high - unless the average size of an httpd process is like around 4MB (doubtful).
Sep
30
awarded  Explainer
Sep
3
revised Maximum server attempts from upstream in Nginx
added 2 characters in body; edited title
Aug
5
comment How to free linux memory safely to improve server performance
You can add swap if you can't reboot but it won't improve performance. Production servers, especially those running DB servers, shouldn't swap as it kills performance.
Aug
5
comment How to free linux memory safely to improve server performance
Not only will it go up again but the OOM Killer will eventually get invoked (unless it's been disabled) and take down your production service anyway. You need to add more memory and/or carefully manage the memory usage of your application.
Jul
22
awarded  Yearling
Jul
8
comment Growing OS cache in RAM causing high system CPU usage
Could it be kdmflush is active when you have the high CPU usage? Maybe you need to adjust vm.dirty_* tunables.
Jul
8
comment Growing OS cache in RAM causing high system CPU usage
I'm no expert on this issue but it appears that even with the setting at 0 it can cause issues (see: rhaas.blogspot.ca/2014/04/…). You haven't said what kind of application you're running but here is an attempt at a solution in the MySQL world (blog.jcole.us/2012/04/16/a-brief-update-on-numa-and-mysql). Let me know if this is on the right track! I'll make it an answer.
Jul
8
comment Growing OS cache in RAM causing high system CPU usage
I think Matthew Ife is suggesting that the behavior you see might be related to the "zone reclaim" issue.
Jul
7
comment how do I move where percona mysql stores the databases?
I find it ironic that you're using the Percona distribution but don't know about the datadir system variable.
Jul
7
comment Nginx SSL Termination - How to encrypt data to client?
X-Forwarded-For sends the client's IP address rather than the proxy's IP address. You still need to edit your Apache logging though in order to register the client's IP address. i.e. LogFormat "%{X-Forwarded-For}i ...
Jul
7
comment Nginx SSL Termination - How to encrypt data to client?
No, the data from the client/browser to nginx will be encrypted provided nginx has been configured appropriately. nginx then proxies the requests (unencrypted) to the Apache web servers.
Jul
7
comment Nginx SSL Termination - How to encrypt data to client?
"The connection from nginx to Apache to retrieve the data for nginx to send to the browser should be a regular http connection with no SSL" provided you are on a private VLAN.
Jul
2
awarded  Curious
Jul
1
awarded  Popular Question
Jun
13
comment Backup Solr home
Why would you need to backup Solr? Aren't you just indexing data that originates elsewhere? That data should be backed up but you should have a process to re-index the source data.
May
20
comment How to handle virtual environments on a secure network
Have you looked at Vagrant (www.vagrantup.com)?
May
20
revised How to handle virtual environments on a secure network
edited title
May
7
accepted Red Hat Software Collections 1 Beta channel has 0 packages?