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Jan
22
comment Unusually high nfs_inode_cache
What versions of RHEL are you using? There was a known issue related to this awhile ago. access.redhat.com/solutions/481743
Jan
22
comment Haproxy using 10GB Memory and 100% CPU with 50k connections
You can reduce memory consumption by having fewer connections. What version of HAproxy are you using? Have you looked at brokenhaze.com/blog/2014/03/25/…
Jan
22
comment Email Sending over Distributed System?
On modern hardware, unless you have huge lists, the bottlenecks are often the recipients rate-limiting requests. Proper tuning of the system and completing the bulk mailing requests at problematic IPs can impact things significantly. Also you may want to read the docs as it specially addresses clustering. mailenable.com/support/MEEICG.pdf
Jul
29
comment How to setup Apache 2.2.3 to send “last modified” etc
The term weak is simply semantics. The point is that using Last-Modified headers in the absence of other caching instructions leaves the cache period up to the HTTP client. If a resource has not been modified since the Last-Modified date, the resource should be considered fresh. In contrast, when using an Expires or Cache-Control header the origin can set an explicit freshness period.
Jul
21
comment ssl certificate - identity not verified with godaddy
Please update the ticket with the specific domain as there are many test tools that can quickly spot the issue.
Jul
10
comment debug mysql crash
Please update this ticket with your mysql error log. What version of MySQL are you using? Please include any other specific errors.
Jun
30
comment How many power circuits do I have in a rack?
I should have said 2x30A 110V. I think that's what we used to have. Don't forget room for a switch (if needed) and out of band tools. The last thing you want is a tripped circuit breaker. Also if you do run near peak, be sure to have your PDU enforce staggered power ups. Nearly any system can cause an amp spike on power-up.
Jun
30
comment When to increase AWS RDS MySQL Server instance to larger CPU/RAM?
What is the performance/capacity problem you are trying to resolve?
Jun
30
comment Nginx port redirection on Ubuntu
Please see serverfault.com/help/how-to-ask. Post your current configurations, state your goals and specific error your are receiving. What results do you get now? Unlike some sites, SF is geared to professional conversations about system administration not a how-to or tutorial discussion group.
Jun
30
comment How many power circuits do I have in a rack?
Most colo facilities will permit no more than 2x20A of power in one rack. Contact your specific colo provider for details. City fire ordinances may limit the power as well. For your systems, I would ask the manufacturer what is the expected amp draw and peak load. You will want to provision power such that you have some overhead for switches, out of band management tools etc. Note that most providers want you to stay within 80% of your peak usage so not to trip circuit breakers.
Jun
30
comment Nginx 502 Bad Gateway - 111: Connection refused, port not being listened to
@ADM I think that error only happens if you try to spin up another pool on the same port. This would need to be verified but I don't think that error occurs if you have two pools with the same name but different ports.
Jun
26
comment No route to host centos
Man pages are your friend. ipset.netfilter.org/iptables.man.html see the delete chain rule.
Jun
26
comment No route to host centos
Your iptables -N rule is creating a new chain. Chains are processed and then passed back into the main rules. So in this case your NRPE rule passes that traffic into the NRPE chain, which does not have an accept rule. By default it will drop traffic.
Jun
26
comment No route to host centos
On the client side (the server you are telnetting from) post the results of route -n. You could have a routing table issue. If you stop iptables on the destination server, can you connect? Also note with NRPE you need to configuration authentication but that should not stop you from connecting to the port.
Jun
25
comment Yum does not install specific RPM version with custom repo
You may have a naming issue. You may want to compare package information between two packages using rpm -qp in your repo. I don't see why you would get this behavior without a repo data, package naming or corrupted RPM database.
Jun
25
comment Yum does not install specific RPM version with custom repo
What is the result of yum list --showduplicates package package-database
Jun
25
comment rkhunter warnings - whitelisting
What version of rkhunter are you using? Make sure you do not have multiple copies of rkhunter installed. I've seen issues when you install from RPM and source and you end up with different configuration files. Check /usr/local/etc and /etc/ for config files.
Jun
25
comment What are the pros and cons of using S3 as a data access server?
You may want to rework your post into how to use S3 as a configuration management system. As it is worded, I think we will end up with a debate about configuration management - which would be off topic.
Jun
25
comment dig & nslookup can't resolve local hosts unless I specify the (local) DNS server to use
Appears you are querying different nameservers. Appears 142.3.102.202 does not have any A records configured for the domain. So I am not sure where you are managing records?
Jun
25
comment dig & nslookup can't resolve local hosts unless I specify the (local) DNS server to use
Do you have a nameserver running on your localhost?