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• compile kernel 2.6.34 for Ubuntu Lucid for xen dom0 / pvops

  - by andreash

  Hi there, I'd like to compile a recent Linux kernel (2.6.34) for my Ubuntu 10.04 Lucid Lynx AMD64 box, mainly because I'd like to use it as a dom0 kernel with the recent xen4. There's plenty documentation on the web about how to compile a kernel 'Debian style'. But what I think would be nice to start with an 'official' Ubuntu config to be sure not to miss any important things and having to recompile over and over again. So what I'd like to do is compile 2.6.34, but starting with the 'official' /boot/config-2.6.32-XX from Ubuntu Lucid. The question is: How do I best do that? If I just take the config from 2.6.32, the new features from 2.6.33/34 won't be in the config. So what I'd like to do is somehow the 2.6.34 config with the original 2.6.32 one from Ubuntu. How can I best do that? Does it even make sense? Is there easier ways to achieve what I want? Thanks for your insight! A. PS: I just found a linux-image-2.6.32-bpo.4-xen-amd64 package on backports.org, but no information about it. Would it work as a dom0 kernel on Lucid?

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• how to design pound -> varnish -> jboss for ha + loadbalancing

  - by andreash

  Hello, I'm planning a new infrastructure for our web application. We have two JBossAS5 servers, running in a cluster. Session state will be replicated via JBoss Cache. In front of that, there should be some cache, to speed up delivery of static elements. However, most of the traffic to our app will be via HTTPS. So far, I had been thinking of two Varnish caches in front of the JBossASs, each being configured for loadbalancing to the two JBossASs via round-robin. Since Varnish doesn't handle HTTPS, then there would need to be two pound proxies in front of the Varnishs, dealing with the HTTPS. The two pounds would be made high-available with Heartbeat/LinuxHA. The traffic to www.example.com would then be going through our firewall, from there to the virtual IP of the pounds, from there to the Varnishs, and from there to the JBossASs. Question 1: Does this make sense? Or is it overly complicated, and the same goal can be reached with simpler methods? Question 2: If my layout is fine, how do I configure the pound - Varnish step? Should I a) make the Varnish service high-available through Heartbeat/LinuxHA as well and direct traffic from pound to the virtual IP of the Varnishs, or should I rather b) Configure two independent Varnishs and use load-balancing in pound to address the different Varnishs? Thanks a lot for your insight! Andreas.

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• how to automatically mount ~/Private using ecryptfs when logging in via ssh pubkey

  - by andreash

  Raionale: I want to be able to automatically make backups to a remote machine, which will be encrypted with ecryptfs. The title says it all: I set up ecryptfs-utils on my Debian Squeeze box, and set up one user to use it via ecryptfs-setup-private. When I log in via SSH using password authentication, the ~/Private directory automatically gets mounted. How can I achieve that ~/Private also automatically gets mounted when logging in via SSH using public key authentication? Obviously, the best solution would be if ecryptfs could somehow 'use' the SSH public key to en/decrypt the data (I know that then using the user's password would not be able to en/decrypt the data any more; this would be acceptable). Probably, this will not work. So perhaps somehow call ecryptfs-mount-private via ssh before logging in via public key? Probably, then I would need to somehow pipe the passphrase through the SSH connection, right? So I would need to store it on the source machine's file system. Not nice either. Any other ideas?

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• Which is the best way to deploy a JBoss application?

  - by andreash

  Hi there, we are currently developing a JBoss application. To deploy it, we have a total of four servers (three years old). I am wondering which might be the best to do? There could be a load balancer (even a load-balancer cluster, for failover) in front of two servers, each holding one JBoss and one PostgreSQl host inside XEN environments. Does this make sense? Are there other, better options? Thanks a lot for your advice!

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• How to store etckeeper repositories on a central server via git

  - by andreash

  Hello, I would like to have one central git repository for all my servers' etckeeper .git repos. Here the suggestion was to use a file in /etc/etckeeper/commit.d, which basically looks like this, assuming that a git repo had been set up in somedir on somehost: #!/bin/sh cd /etc git push faruser@farhost:somedir The problem with this is, that it would be really nice to have all servers in the same repo on the central server. I tried git push faruser@farhost:somedir/server1 but that failed. As you can see, I've never worked with git before ... Any ideas on how this can be accomplished is greatly appreciated :) Cheers, Andreas

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• How to set up a staging apt repository to securely manage upgrades

  - by andreash

  Hello, I would like to be able to run automatic apt-get upgrade (once per hour) on our servers (Ubuntu 10.04), so that I don't have to do it manually on all of them (about 15). However, for production machines, that's not a good idea ... So here's my idea: Set up a local repository for all 'approved' updates for critical packages. I would then push updated packages from upstream to our local repo after I tested them, and all servers could automatically (apt-cron?) upgrade from this repository. So my question is this: How do I configure apt on the clients so that they use the local repository only for all packages which exist on the local repository, and the upstream one for all other packages? Does this actually make sense? Or am I missing something? Anyways, thanks for your insight! Andreas.

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• table alias (or 'symlink') in mysql

  - by andreash

  Hi there, in MySQL5.1, is there a way to make one table accessible by two different names? I'm thinking about somethink like a symlink on linux filesystems. I know theres the CREATE VIEW myview AS SELECT * FrOM mytable thing, but I don't only need to SELECT from both names, but also delete etc ... You might ask why I want to do this? It's about getting a commercial, closed-source app to work, which is crappily programmed (usually, the table names are all lower-case, but occasionally, they use capitalized names for the same table ...). Oh, that would be another idea: Is there a way to tell MySQL not to care about capitalization of table names (like on Windows filesystems?)? that would also do the trick ... Thanks for your insight! A.

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