Discuss March 2011

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286 participants
250 discussions

centos server network speed check???
by mcclnx mcc 29 Mar '11

29 Mar '11

we have several servers on same rack and servers are all inside firewall. Centos version from 4.X to 5.X. sometime the connection are very slow (compare to servers on other racks also inside firewall). we discuss with network engineer he ask us use "ping" and traceroute" to check. Both tools response time are good but if we connect through application like Web browser, database, or DELL OPMN tool. The response time is very very slow. This situation normally last 4 to 5 hours then it back to normal. Does there has way to check "real" network response time so we can show to network engineer. Otherwise they always say "no problem". Thanks.

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VMware vSphere Hypervisor (free ESXi) and mdraid
by Jussi Hirvi 29 Mar '11

29 Mar '11

Can I combine VMWare ESXi (free version) virtualization and CentOS mdraid level 1? Any pointers how to do it? I never used VMWare before. - Jussi -- Jussi Hirvi * Green Spot Topeliuksenkatu 15 C * 00250 Helsinki * Finland Tel. +358 9 493 981 * Mobile +358 40 771 2098 (only sms) jussi.hirvi(a)greenspot.fi * http://www.greenspot.fi

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Rules for port forwarding
by admin lewis 29 Mar '11

29 Mar '11

Hi, does anyone remember the rules for port forwarding ? the followings does not work: iptables -A FORWARD -i eth0 -o eth1 -p tcp –dport 80 -j ACCEPT iptables -A PREROUTING -t nat -p tcp -i eth0 –dport 80 -j DNAT –to 192.168.20.1:80 thx lewis

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Re: [CentOS] Corporate support for CentOS
by Ian Murray 29 Mar '11

29 Mar '11

> > What makes you think CentOS is not willing to be commercially sponsored? > (Or only work developing CentOS?) > > I would LOVE to be able to do CentOS as my only job. > > No one that we know of is willing to pay a full time salary for 1 or 2 > or 3 people to develop CentOS. If they would pay for it, we would > likely do it. > > They might be willing for us to let their current employees do some > CentOS things ... but not willing to pay for CentOS development. Sorry, that was just my impression from previous posts. I guess I have that wrong. Maybe I am confusing the reluctance to take donations at the moment with commercial sponsorship. Thanks for correcting me. Couple of questions, then.... What is the average current time commitment per week, i.e. man hours that is currently volunteered by the core developers? What would that need to increase to, to significantly reduce release times (which I think was the overall goal)? What would the *market rate* be for the skills required? Just to give a rough figure to work with and shouldn't be related to any particular person's current day job. Thanks in advance, Ian.

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check memory configuration
by William Warren 28 Mar '11

28 Mar '11

What's there way to do this? AKA is there a proc command that will show me what chips i have installed in a server without having to crack the case? Just a general pointer is fine..:)

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how to do this create the keyset-file for dnssec
by fakessh ＠ 28 Mar '11

28 Mar '11

it is, I'm coming I do not understand the need to recreate and validate the file keyset-en ....... I then recreate a good record with the key in this file and my past signatures are good. I did not understand correctly the operation of dlv keyset files and I recreated downgrade bind to the stable version 9.3 of CentOS 5.5 and using webmin. can you give me the command to use to create files Keyset I did not find any documentation regarding the creation of this type of file how to do this create the keyset-file for dnssec -- gpg --keyserver pgp.mit.edu --recv-key 092164A7 http://pgp.mit.edu:11371/pks/lookup?op=get&search=0x092164A7

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lvremove failed on install
by Steven Vishoot 28 Mar '11

28 Mar '11

Hello, I was trying to install CentOS-5.5-i386-bin-DVD tonight and kept on getting this same error and i have no idea what is causing this annoyance and not letting me complete the install because as soon as this error is produced it says this a bug and should be filed. Before I file a bug report i would like to know if anyone else ran into this and would mind pointing me in the right direction or a link to the solution. The full output is: http://pastebin.com/eEYZigrz i am hoping someone would be able to help, because i have no clue what is going on except that it is failing on trying to remove a volume group. Thanks Steven

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Verify tomcat config
by lhecking＠users.sourceforge.net 28 Mar '11

28 Mar '11

I'm going to retire an old RHEL3 server and move the services to CentOS5. In particular, the web server is giving me a headache. On the old box, there's a hacked-up httpd/mod_jk/tomcat setup, and CentOS is perfect for the new box because the required components are included and the whole setup "just works" straight from installation. There seems to be surprisingly little documentation or how-tos on how to migrate from the above setup to httpd/mod_proxy_ajp/tomcat. I believe I have it working correctly on a test machine, but am looking for someone to look over the config to make sure it's correct and complete. The desired setup is: - httpd receives all requests - httpd processes all requests for static content - httpd passes all requests for dynamic content to tomcat Most examples I found seem to assume that all queries, including static, are pased on to tomcat. To implement the correct behaviour, I came up with this conf.d fragment: <LocationMatch ".*WEB-INF.*"> AllowOverride None deny from all </LocationMatch> <Proxy *> AddDefaultCharset Off Order deny,allow Allow from all </Proxy> ProxyPreserveHost on ProxyPassMatch ^(.*\.jsp)$ ajp://localhost:8009/$1 The second bit was much harder to figure out - point tomcat to httpd's DocumentRoot. I came up with the following snippet: use the included /etc/tomcat/server-minimal.xml as server.xml and make the following change: --- server-minimal.xml 2010-10-11 00:16:41.000000000 +0100 +++ server.xml 2011-03-20 01:48:12.000000000 +0000 @@ -18,7 +18,9 @@ <Engine name="Catalina" defaultHost="localhost"> <Realm className="org.apache.catalina.realm.UserDatabaseRealm" resourceName="UserDatabase" /> - <Host name="localhost" appBase="webapps" /> + <Host name="localhost" appBase="webapps"> + <Context path="" docBase="/var/www/html" reloadable="true" /> + </Host> </Engine> </Service> Any comments/suggestions? Would I be better of to stick with mod_jk even on CentOS?

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Installing php-mcrypt
by Todd Cary 28 Mar '11

28 Mar '11

It has been 6 years since I set up my Linux server and have hardly had to touch it in all of those years other than running yum update, so I ma rusty in some of the fine details (especially at 72). I located a source for the php-mcrypt rpm (php-mcrypt-5.1.6-15.el5.centos.1.i386.rpm), however, isn't there an easier method to get and install the appropriate rpm - other than downloading it then running rpm? And when should I use yum rather than rpm? For those of you that use Linux daily, these are very simple question, and for that please accept my apologies. Dr. Todd -- Ariste Software Petaluma, CA 94952 http://www.aristesoftware.com

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Re: [CentOS] Virtualization platform choice
by Chuck Munro 28 Mar '11

28 Mar '11

On 03/27/2011 09:00 AM, Jerry Franz wrote: > > On 03/27/2011 02:57 AM, Jussi Hirvi wrote: >> > Some may be bored with the subject - sorry... >> > >> > Still not decided about virtualization platform for my "webhotel v2" >> > (ns, mail, web servers, etc.). >> > >> > KVM would be a natural way to go, I suppose, only it is too bad CentOS 6 >> > will not be out in time for me - I guess KVM would be more mature in >> > CentOS 6. >> > >> > Any experience with the free "VMware vSphere Hypervisor"?. (It was >> > formerly known as "VMware ESXi Single Server" or "free ESXi".) >> > >> > http://www.vmware.com/products/vsphere-hypervisor/overview.html >> > >> > I would need a tutorial about that... For example, does that run without >> > a host OS? Can it be managed only via Win clients? Issues with CentOS >> > 4/5 guests (all my systems are currently CentOS 4/5). > I'm currently using Ubuntu Server 10.04-LTS as a host for KVM running > CentOS5.5 guests I migrated from VMware Server 2. Works fine. A nice > feature of current generation KVM is that you are supposed to be able to > do live migration even without shared storage (although I haven't tested > that yet). I wrote some custom scripts to allow me to take LVM snapshots > for whole-image backups and I'm pretty happy with the who setup. > > The only corners I encountered were > > 1) A lack of documentation on how to configure bridging over bonded > interfaces for the host server. It turned out to be fairly easy - just > not clearly documented anyplace I could find. > > 2) The default configuration for rebooting/shutting dow the host server > just 'shoots the guests in the head' rather than having them shutdown > cleanly.:( You will want to write something to make sure they get > shutdown properly instead. > Once in a while I find it's useful to compromise just a little, so I use Scientific Linux 6 as the Host OS, and run a bunch of CentOS-5.5 Guest VMs. It all simply works. KVM has improved quite a bit, and the management tools work well. One thing that requires a bit of skill is getting bridging configured (which I simply did by hand from the RHEL-6 documentation). I'm happy with the result, and see no reason to replace the underlying SL-6 Host distro. SL-6 as the Host is rather slow to shut down gracefully and reboot, because it hibernates the Guest OSs, one at a time, rather than just killing them. Hibernation takes a while to write out to disk if you've assigned a lot of RAM to the Guests. Bootup has to restore the saved state, so that's a bit slow too. But it works very well. I use partitionable RAID arrays for the Guests, and assign a "raw" md device to each one rather than using the 'filesystem-in-a-file' method. It seems to be a bit faster, but there's a learning curve to understanding how it works. One thing I found a bit annoying is the very long time it takes for a Guest to format its filesystems on the RAID-6 md device assigned to it. That's mostly due to array checksum overhead. RAID-10 would be a *lot* faster but somewhat less robust ... you pick what's best for your own situation. Chuck

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Discuss March 2011