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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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Re: [CentOS] Corporate support for CentOS
by Ian Murray 27 Mar '11

27 Mar '11

> > What the CentOS project would be interested in (from a corporate > provider) would be to hire people and allow them to do CentOS related > things. > > We are not interested in being paid in addition to our current work, but > making taking care of CentOS our only work. > > There are many things other than building packages that have to be > maintained for making CentOS go. These include: > > 1. We have dozens (more than 100) servers that need to be maintained in > tens of countries all world. These machines need to be updated and > managed, including monitoring and taking corrective action for any > services that go down. > > 2. We have to maintain lists of update mirrors, rsync mirrors, DVD > mirrors and verify that the "Dynamic DNS list" for all these machines > stay in sync when mirrors drop out or can be added back. > > 3. Manage the CentOS DNS services, the CentOS mail services, the > mailing lists, the IRC Channels, and the main website. > > 4. We have to write/configure/change software to ensure our mirrors are > up-to-date and control the release of updates. Our update system gives > out GEO-IP relevant targets for download of ISOs and updates. > > 5. We have to research/answer bugs and maintain the bugs.centos.org > website. > > There are many things that we could do if CentOS was our only > responsibility. > > The cost to a corporate entity would be to hire one or more developers > full time and designate them to working only on the project. If someone > were willing to do that, we would be willing to listen. Right, so rather than money for CentOS to hire its own employees, you'd be looking for corporate sponsor to donate their employee time, i.e. full time person/people. I was more thinking of the former, but I think that was a long shot at best. Oh well hopefully someone might come forward.

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Re: [CentOS] Corporate support for CentOS
by Ian Murray 27 Mar '11

27 Mar '11

>There have been a number of recent conversations on the developer list and this list about CentOS. My initial thought was why not have CentOS and SL merge. Since they have different goals I can understand the reason not to. So my next question is, has no corporate entity offered to sponsor full time people to work on CentOS? It seems like a lot of companies use CentOS for various things. I can't believe no one is willing to help speed development by paying for people to build full time. Has this subject come up before? > As far as I can tell, it is as simple as this:- The volunteers that create CentOS like things the way it is and it isn't likely to change. We seen it said a number of times, if we don't like it then go somewhere else. I suggest there might be room for another rebuild project that is open to commercially sponsored, i.e. somewhere else. This would n't be a 'rival' because its aims would be different. I'll be honest though, I don't realistically see enough money coming in to put people full-time onto it, though, when you consider market rate for the skills required.

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updating without rebooting
by Fajar Priyanto 27 Mar '11

27 Mar '11

Hi all, I'm curious. If I do yum update (which include kernel update) but don't reboot. Is it OK? I mean apart of the kernel, other things like services, we don't have to reboot if we don't have the chance to do it (postponing to some other date), right? Thank you.

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My new server
by Timothy Murphy 27 Mar '11

27 Mar '11

I bought a very cheap server yesterday - an HP ProLiant micro server for 160 euro (280 euro with 120 cashback, for some reason). But I was surprised when I opened the box to find it didn't come with keyboard or mouse, and doesn't have the old keyboard/mouse sockets, but requires USB versions. Is that the norm nowadays? Is it possible to convert the old keyboard/mouse plugs? Also there is no CD drive. But there are extensive instructions (on a CD!) about how to instal RHEL-5.5. I'm not complaining, just surprised. I got it as a fall-back for my aging server. The ProLiant is incredibly quiet, at least by comparison. One last thing - there is only one ethernet socket. This surprised me a little, as I can't see how it can be used as a server, without adding a second ethernet input? -- Timothy Murphy e-mail: gayleard /at/ eircom.net tel: +353-86-2336090, +353-1-2842366 s-mail: School of Mathematics, Trinity College, Dublin 2, Ireland

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Corporate support for CentOS
by Gary Scarborough 26 Mar '11

26 Mar '11

There have been a number of recent conversations on the developer list and this list about CentOS. My initial thought was why not have CentOS and SL merge. Since they have different goals I can understand the reason not to. So my next question is, has no corporate entity offered to sponsor full time people to work on CentOS? It seems like a lot of companies use CentOS for various things. I can't believe no one is willing to help speed development by paying for people to build full time. Has this subject come up before?

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Re: [CentOS] My new server
by Peter Larsen 26 Mar '11

26 Mar '11

You get what you pay for. Yes ps/2 plugs are a thing of the past. Servers have for the last 5 or so years been usb only. Usually with a usb in the front as well as in the back. There are usb/ps2 converters but usb/mouse is very cheap. Your adapter would most likely cost the same or more. Lack of cd drive - sounds like you bought too cheap if you need that. Alternatively, pxe boot and install that way. One nic is also quite common. It depends on what you need the server to do. Regards Peter Larsen Timothy Murphy <gayleard(a)eircom.net> wrote: >I bought a very cheap server yesterday - >an HP ProLiant micro server for 160 euro >(280 euro with 120 cashback, for some reason). > >But I was surprised when I opened the box >to find it didn't come with keyboard or mouse, >and doesn't have the old keyboard/mouse sockets, >but requires USB versions. >Is that the norm nowadays? >Is it possible to convert the old keyboard/mouse plugs? > >Also there is no CD drive. >But there are extensive instructions (on a CD!) >about how to instal RHEL-5.5. > >I'm not complaining, just surprised. >I got it as a fall-back for my aging server. >The ProLiant is incredibly quiet, at least by comparison. > >One last thing - there is only one ethernet socket. >This surprised me a little, >as I can't see how it can be used as a server, >without adding a second ethernet input? > >-- >Timothy Murphy >e-mail: gayleard /at/ eircom.net >tel: +353-86-2336090, +353-1-2842366 >s-mail: School of Mathematics, Trinity College, Dublin 2, Ireland > >_______________________________________________ >CentOS mailing list >CentOS(a)centos.org >http://lists.centos.org/mailman/listinfo/centos

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The delays on CentOS 5.6 are causing EPEL incompatibilities
by Nico Kadel-Garcia 26 Mar '11

26 Mar '11

There are significant components of the upstream 5.6 release which are stuck behind the CentOS 5.6 release process, but are now incorporated in EPEL 5 components. In particular, the "php53" package is now necessary for the "drupal6" EPEL components, due to the long out of date PHP 5.1 in the default upstream vendor's codebase. I see that some of these components are available in the "testing" repository at http://dev.centos.org/centos/5/CentOS-Testing.repo. But this isn't published with centos-release. fasttrack is. Would it be reasonable to push these "testing" components over to "fasttrack"? Given our "upstream vendor's" policy of making all the updates available to all the previous releases in their main "channels", I'm not sure there's any reason not to present them, at least to the fasttrack" channel, and migrate them from "fasttrack" to "updates" as necessary. Other components for such fasttrack publication might include bind97, which some CentOS users have been asking for.

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