Use IPTables NOTRACK to implement stateless rules and reduce packet loss
Disabling IPTables connection tracking for DNS can resolve problems due to too many connections in the connection table.
Posts
Use Getent Hosts in Scripts
It is common practice to use tools like ‘dig’ to lookup DNS results, but this has very bad performance. If you just need to lookup a name or address, there’s an easier, friendly way.
Dont Let Java on Linux Determine Its Own Timezone
Your timezone says Pacific/Auckland but Java reports Antarctica/SouthPole; what gives?
(Ab)using Samba and inotify to implement simple menu of privileged actions
When you want SSH and sudo, but all you have is a Samba share. Similar to using a flag file in a network share to trigger some scripted action, this solution uses inotify to watch for files that get deleted, and then even shows the status of each job.
ORA-12170: TNS:Connect timeout — resolved
ORA-12170
MySQL 5.0 and SSL
I needed to get an old version of MySQL server 5.0 running with SSL on Debian Etch. It was not as simple as you might have thought.
Build an inode Lookup Database using SQLite3
I show a simple but effective use of SQLite3 to help me with an analysis problem.
NFS Lock Analysis with tshark (Wireshark) and Python
NFS locking can impede the performance of your clustered application. Learn how to capture and analyse NFS traffic to see where your locking issues are.