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Category: Linux

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 For the host which is clean by the Gods grace and are still running on the vulnerable Exim and outdated cPanel versions, it is highly recommended to upgrade the cPanel to get Exim patched in the new version 4.92 immediately.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 […]

Liblua error: relocation R_X86_64_32 against `luaO_nilobject_’

The full error will be like as below: ———————— /usr/bin/ld: /usr/local/lib/liblua.a(lapi.o): relocation R_X86_64_32 against `luaO_nilobject_’ can not be used when making a shared object; recompile with -fPIC /usr/local/lib/liblua.a: could not read symbols: Bad value ———————— I got the above error in between easyapache. It’s pretty sure lua is present in server but something went unoticed or bad while its installation. The missing part was nothing but I compiled 32 bit lua in 64 bit server, […]

Error while loading shared libraries: liblua.so

I got this liblua error while apache,php recompilation. At first I tried to find the dependencies of lua # ldd `which lua` linux-vdso.so.1 => (0x00007fff1dd7d000) liblua.so => not found libreadline.so.6 => /lib64/libreadline.so.6 (0x0000003b68800000) libncurses.so.5 => /lib64/libncurses.so.5 (0x0000003b68400000) libm.so.6 => /lib64/libm.so.6 (0x0000003b68000000) libdl.so.2 => /lib64/libdl.so.2 (0x0000003b67800000) libc.so.6 => /lib64/libc.so.6 (0x0000003b67400000) libtinfo.so.5 => /lib64/libtinfo.so.5 (0x0000003b6a400000) /lib64/ld-linux-x86-64.so.2 (0x0000003b67000000) Then I tried to search for liblua in “/” using find command. # find / -iname liblua* /opt/lua/lib/liblua.a /opt/lua/lib/liblua-5.1.so The […]

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 […]

How to change username when you have only one account in Ubuntu?

You cannot simply login as root in Ubuntu at the start up. Do it as the following way: 1) Open terminal and switch to root user. You can open terminal in search or by pressing Ctl+Alt+t. 2) Unlock root account and enable login as root like below # passwd -u root (:::should be as root) 3) Reboot the machine 4) Once the login page appears, press Ctrl+Alt+Fx (x can be from 1 to 6) to […]

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 […]

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