December 2020
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How do I enable mbstring on RedHat 6.4 (Santiago)

I was trying to setup PMA access on one the RedHat server I have. When I execute the command #yum list php*. it does not list php-mbstring package and showing very limited packages. I tried google and found that to enable EPEL and REMI repository to install remaining php extensions. But neither of the attempts […]

Glassfish 3 : There is a process already using the admin port 4848

When I migrated my glassfish server to new server I got the flowing error.

[root@QA02]# /var/glassfish-QA/bin/asadmin start-domain domain1 There is a process already using the admin port 4848 — it probably is another instance of a GlassFish server. Command start-domain failed.

I tried killing all the java process by executing this command “killall -9 java” […]

How do I create swap partition in Linux : mkswap Operation not permitted

One of my old friend is been used a Godaddy VPS for a long time and he is facing issue issue with MySQL over load due to poor RAM resource. After few attempts, I have convinced that I could not able to create swap partition or swap file to enable additional swap to this system. […]

Apache : proxy: HTTP: disabled connection for,Permission denied: proxy: HTTP: attempt to connect to

I’m setting up GitLab for one of my friend on CentOS 6.5 Server. Installations are went through smoothly and I could able to run gitlab service. But it does not showing up on GitLab site over Apache portal and displaying “503 “Service temporarily unavailable” error in Firefox.

After analyzing Apache logs (/var/log/httpd/error) I have […]

Useful information of nslookup, whois commands

nslookup is widely used for identify the issue which related to DNS records. There will be a many cases, that you will be in trouble with outdated DNS cache if the actual DNS entry is changed. Some scenario like Switching server to some other IP, creating/updating new host records [Type A], Changing MX record and […]

JVM : (Too many open files)

Recently we had hit a rare error in one of the nodes in production. This error throws out from JVM and displayed through the Glassfish server.

This is because too many file descriptors’re opened by Glassfish. File descriptor can be limited in both system level and shell level.

To check maximum number of fd […]