OpenLDAP: Bootstrapping a minimal cn=config
- Oct
- 01
- Posted by TKH Specialist
- Posted in linux, openldap
Here is how to bootstrap OpenLDAP’s slapd with an absolutely minimal configuration, without needing an intermediate slapd.conf, with one feature — the local root user (uid=0/gid=0) has “manage” access. From this point, ldapmodify can be used via ldapi to continue … Continue reading →
read moreNeed a quick proxy via SSH?
- Sep
- 14
- Posted by TKH Specialist
- Posted in linux, ssh
Need access to a web site, tucked behind a firewall? Do you already have a public SSH server set up to allow access, but not sure how to tunnel your HTTP session? It’s easy! ssh -N -D 127.0.0.1:8000 <user>@<ssh server … Continue reading →
read moreJuly 1 2012 Linux problems? High CPU/Load? Probably caused by the Leap Second!
- Jul
- 01
- Posted by TKH Specialist
- Posted in java, linux, tomcat
(Update posted, see below) As posted in multiple places around the web: Debian /etc/init.d/ntp stop date `date +”%m%d%H%M%C%y.%S”` Red Hat /etc/init.d/ntpd stop date `date +”%m%d%H%M%C%y.%S”` Update: This first manifested itself for us in our Java stacks — all of our … Continue reading →
read moreBuild a PaaS using Open Source Software
- Jun
- 29
- Posted by TKH Specialist
- Posted in linux, redhat, summit
Discussion about OpenShift. OpenShift has been fully open-sourced, available on GitHub for local deployment, or directly usable as a hosted solution. Rule #1: IaaS != PaaS Virtual machines : Application is not necessarily 1:1 Rule #2: PaaS is not a silver … Continue reading →
read moreKVM Technology Review and Roadmap Update
- Jun
- 28
- Posted by TKH Specialist
- Posted in linux
KVM is a relatively small piece of code, leveraging Linux for much functionality. This makes KVM easy to secure and very flexible in meeting future needs. Leveraging Linux means that KVM automatically gains the power of Linux’s hardware support, memory … Continue reading →
read moreApplication High Availability in Virtual Environments
- Jun
- 27
- Posted by TKH Specialist
- Posted in linux, redhat, summit
http://www.redhat.com/summit/sessions/index.html#394 Great discussion around Red Hat’s solutions for clustering, fencing, etc, in virtualized environments. Fencing is /very/ important for shared resources, especially disk. In a virtualized world (RHEV, VMWare, etc), fencing tools can reach right into the hypervisor to kill … Continue reading →
read moreDistributed File System Choices: Red Hat Storage, GFS2, & pNFS
- Jun
- 27
- Posted by TKH Specialist
- Posted in linux, redhat, summit
Red Hat has several options for storage needs — GFS2, CIFS, (p)NFS, Gluster. It’s all about right tool for the job. http://www.redhat.com/summit/sessions/index.html#103 RHEL Resilient Storage – GFS2 Shared storage, scales up to 100TB per instance, supports 2-16 nodes in the … Continue reading →
read morePHP Debugging: Displaying Error Message in HTML output
- Jun
- 26
- Posted by TKH Specialist
- Posted in linux
When debugging PHP code, it can be useful to display PHP errors within the output. Normally, PHP error messages are written to the Apache log. To have PHP errors in your browser output, you can use this command in your … Continue reading →
read moreStarting Google Apps and GAM (Google Apps Manager)
- Jun
- 12
- Posted by TKH Specialist
- Posted in linux
GAM is a command-line tool for manipulating Google Apps accounts. It is written in Python, and uses Google’s gdata Python module. GAM is documented at http://code.google.com/p/google-apps-manager/. The gdata Python module is documented at http://code.google.com/p/gdata-python-client/. Installing GAM When you install GAM, … Continue reading →
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