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Category: Redhat/Centos/Fedora

Prefer/Precedence IPv4 over IPv6 for DNS lookups

We had an issue with DNS lookup/Querying the whois servers(Example: whois.crsnic.net) while Domain Search/Registration for any TLDs through WHMCS, Domain Manager etc. The tool/system used to timeout whenever the users searched a domain for availability. We found the following via CLI when telnet’ing to the whois server directly. The above indicates it attempts IPv6 DNS lookup first but the whois server doesn’t support or provide it, later our server tries IPv4 DNS lookup and it […]

How to clean up a hacked server from the Exim vulnerability CVE-2019-10149 | Temporary workaround | cPanel

The recently reported Exim 4.87 to 4.91 versions vulnerability CVE-2019-10149 is of very intense. Many host servers have already been hacked by now. For the host which is clean by the Gods grace and are still running on the vulnerable Exim and outdated cPanel versions, it is highly recommended to upgrade the cPanel to get Exim patched in the new version 4.92 immediately. The solution to avoid such a hack issue to upgrade the cPanel […]

OpenVZ vps creation “Error in check_mount_restrictions (ploop.c:1627)”

I wasn’t able to create new vps in node due to following ploop error. From the log ————————— Creating image: /vz/private/350.tmp/root.hdd/root.hdd size=2306867K Creating delta /vz/private/350.tmp/root.hdd/root.hdd bs=2048 size=4614144 sectors v2 Storing /vz/private/350.tmp/root.hdd/DiskDescriptor.xml Error in check_mount_restrictions (ploop.c:1627): The ploop image can not be used on ext3 or ext4 file system without extents Failed to create image: Error in check_mount_restrictions (ploop.c:1627): The ploop image can not be used on ext3 or ext4 file system without extents [21] Destroying […]

Wowza Streaming Engine (RHEL/Centos/Fedora)

Wowza Streaming Engine (known as Wowza Media Server prior to version 4) is unified server software developed by Wowza Media Systems. The server is used for streaming of live and on-demand video, audio, and RIAs (rich Internet applications) over IP networks to desktop, laptop, and tablet computers, mobile devices, IPTV set-top boxes, internet-connected TV sets, and other network-connected devices. The server is a Java application deployable on the following operating systems: Linux, Mac OS X, […]

Red5 Media Server: Installation And Configuration (Centos/Fedora/RHEL)

Red5 Media Server delivers a powerful video streaming and multi-user solution to the ¬©Adobe ¬©Flash Player and other exciting client technologies. It works based on Java and some of the most powerful open source frameworks, Red5 stands as a solid solution for business of all sizes including the enterprise. Features ———— Streaming Video (FLV, F4V, MP4, 3GP) Streaming Audio (MP3, F4A, M4A, AAC) Recording Client Streams (FLV and AVC+AAC in FLV container) Shared Objects Live […]

Install FFMPEG in Fedora/Centos/RHEL

Introduction ———— FFmpeg is a free software project that produces libraries and programs for handling multimedia data. FFmpeg is the leading multimedia framework, able to decode, encode, transcode, mux, demux, stream, filter and play pretty much anything that humans and machines have created. It supports the most obscure ancient formats up to the cutting edge. No matter if they were designed by some standards committee, the community or a corporation. Reference from https://www.ffmpeg.org/about.html How to […]

CHECK_NRPE: Error – Could not complete SSL handshake

If you find this error in nagios for a particular server, this means nothing but the nrpe check from nagios server cannot able to complete the service check to client server. You can check this through command line itself, run the following in nagios server. # /usr/local/nagios/libexec/check_nrpe -H hostnameORclientserverIP -c check_load CHECK_NRPE: Error – Could not complete SSL handshake. You may need to cover different scenarios for this to troubleshoot. 1) Check if the particular […]

cloudlinux: PHP selector NOT working or BROKEN

It was truly devastating and I was dismayed when I noticed the PHP selector in server got broken or stopped working since the last easy-apache. Tones of tickets were popped in when clients lost their custom php versions and its custom settings I tried to select the php version 5.4 for the domain and set post_max_size and upload_max_filesize to 32MB each           And I checked by putting a phpinfo page in […]

Proper Method To Change Default Mysql Engine Permanently

Here the mysql engine is set to InnoDB by default and I want to change it to MyISAM for long run. It was the old way setting parameter “skip-innodb” and commenting “innodb_file_per_table=1” in my.cnf file. Additionally we used to execute mysql query “SET storage_engine=MYISAM;”. Now a days, the above changes wont work and perhaps the mysql server doesn’t come back after initiating a restart since the changes made. The proper method is set the variable […]

Re-setup and configure the broken WiFi network in RHEL/CentOS/Fedora

Recently I installed CentOS on my VAIO laptop and I had to do some further up-gradation of outdated packages, but that shoved me into a real headache. The WiFi network was working good till starting the upgradation procedure, but stopped right after completing the process. I had no idea then about how this was happened. I was getting only the following information from ifconfig wlan0 Link encap:Ethernet HWaddr A4:17:31:E0:B6:47 inet6 addr: fe80::a617:31ff:fee0:b647/64 Scope:Link UP BROADCAST […]

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