Tips on securing a compute cluster?
At my university I just setup an HPC cluster with 16 compute nodes, one file server and one head node. Only the head node is connected to an external network (which is visible to the world). The...
View ArticleSo I just landed my first Linux orientated job; Junior Linux Sys Admin....
Here's how it goes:Stuck in a shitty 1st Line support job, which requires, quite literally, the technical capabilities of a spoon...Secure a position at another company, doing 1st, 2nd and 3rd Line...
View ArticleHow would I go about making a development server from the current state of my...
I have a Centos 5.8 box running an old version of Mediawiki (1.16) with an old version of php (5.1.6). I'm seeking to update Mediawiki, which requires php 5.3, but since php 5.3 is in package "php53"...
View ArticleHow can an interface be throttled?
Running CentOS 6.3 with two NICs, and specifically trying to throttle vsftpd connections. I want to throttle the interface to our DMZ network, while leaving the interface to the internal trusted...
View ArticleLoad ssh keys automatically when needed, have different ssh-agents for...
submitted by markyosti [link][4 comments]
View ArticleSelf-taught vs course
I've been using Linux for ~3 years now as my primary OS and am relatively comfortable with using basic commands and such but I want to start learning more and eventually get a job as a Linux Admin. In...
View ArticlePermission Craziness
I'm not sure if what I'm trying to do is achievable but here goes. I'm trying to allow 2 users full permission in a directory, while also allowing them full permissions on folders/files they copy into...
View ArticleGood tools to perform security scan/audit of the server.
I know a few tools like chkrootkit rkhunter. Any other good suggestions for Redhat servers? submitted by iam_root [link][1 comment]
View ArticleLost in the Clouds: Openstack? Cloudstack? Ganeti?
So, I'm thinking about building my own cloud. I have many hosts which I could run Xen or KVM or ESXi on them (and how do I pick which one I need?). I have a few hosts running ESXi. I wish to have an...
View ArticleI've hit a wall with Samba authentication using openLDAP and SSSD.
This is set up on CentOS 6 using Samba 3 with SSSD. SSSD is definitely working fine as any LDAP user can ssh in without a system account. I can also return user values using the id command. The problem...
View ArticleNUMA, KVM, and big big RAM
I would like to create a KVM VM with a large amount of RAM. I am learning about NUMA. My server's NUMA configuration is below. Is this as simple as saying, "I have four sockets and eight nodes so I...
View ArticleWhat my co-worker sees when he logs into our Linux systems. (not very...
submitted by revotik [link][10 comments]
View ArticleSetting a path variable for a non-interactive Bourne shell (yes Bourne)
So here is an odd scenario...I have a device that runs Linux, and is accessible via ssh. What I need is to be able to set the path variable for a non-interactive shell. The device had only one shell,...
View ArticleHelp for K-12 School District
I'll give you the short and skinny on my current situation and what goals I was given today by my Superintendent.We currently are running mostly on Novell Netware 6.5, my servers range from a Gateway...
View ArticleSamba Server doesn't have sufficient permissions
Hey there,I've got a small homeserver running CentOS 6.3 for some filesharing and hosting my blog and a TS3-server. I've set up Samba before and everything seemed fine (used it as a backup on my...
View ArticleThat feeling when you SSH into the wrong server... the screenshot tells the...
submitted by Ajxkzcoflasdl [link][102 comments]
View ArticleStruggling with virtual hosts
Hi,I'm getting an Apache server configured, but so far I don't seem to quite understand virtual hosts (and it seems the way Linux handles hosts in general).1) When I add a line to /etc/hosts to resolve...
View ArticleAny IPTables people want to give me a hand?
I'm looking to redirect all youtube traffic out a second ISP link, I'm thinking I can do this with iptables on my main proxy with a command like this: iptables -t nat -A PREROUTING -p tcp --dport 80 -m...
View ArticleScript to join RHEL 5 Server to Windows 2008 R2 Active Directory domain
I posted this over in /r/sysadmin as well but it's not generating much interest. Thought I'd try here as well. This script grew out of a manual process that I documented on my blog some months back....
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