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The Linux bonding driver provides a method for aggregating multiple network interfaces into a single logical "bonded" interface. The behavior of the bonded interfaces depends upon the mode; generally speaking, modes provide either hot standby or load balancing services. Additionally, link integrity monitoring may be performed.

https://www.kernel.org/doc/Documentatio ... onding.txt

On Debian first install the ifenslave package, necessary to enable bonding:

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apt-get install ifenslave

Decide which bonding mode is desired ...

Letsencrypt (link) provides free SSL certificates for websites. Process of issuing certificate (and renewal) is greatly simplified by certbot scripts (former letsencrypt-auto) written in python.
Here we will install certbot on Centos 7 and issue SSL certificate for example.com/www.example.com running on Nginx.

Certbot installation instructions can be found at certbot.eff.org or at GitHub repo.
Certbot is packaged in the EPEL repository. Enable EPEL on your system and install Certbot:

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yum install epel-release
yum install certbot

...

Sometimes you my require to add custom root CA certificates to trusted list on your server.
In this example we will add Root Certificate and Intermediate Certificate from CAcert free community-driven Certificate Authority.

General solution can be found at their wiki, but it lacks details about update-ca-trust method.

First, we install ca-certificates package:

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yum install ca-certificates

Then enable dynamic CA configuration feature:

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update-ca-trust enable

Time to download root and intermediate certificates in PEM format:
wget ...

It`s easy if you have eix installed:

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eix -Jc

Short oneliner to set CPU scaling governor to 'performance':

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echo performance | tee /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor

In order to disable Baloo indexer you may do the following:

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cp /usr/share/autostart/baloo_file.desktop ~/.kde4/share/autostart/
echo "Hidden=True" >> ~/.kde4/share/autostart/baloo_file.desktop

It will prevent start of Baloo service on KDE start for a current user.

Everytime you install or update packages with yum on Centos5/RHEL5, it tries to install both x86_64 and i386 versions of the package if both are available.
This problem arise only on Centos5 because yum defaults to:

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multilib_policy=all

what means install all available architectures of package. For example, if you are running 64bit system, yum will first try to install package.x86_64, if it`s not available yum will fall back to i386 and noarch.
This was changed ...

By default linux distributions (not only) expect that default gateway IP address belongs to configured subnetwork on the interface and is not a broadcast address.
As a result we will receive the following error trying to define gateway outside of configured network:
# ifconfig eth0
eth0 Link encap:Ethernet HWaddr 00:16:3E:29:5A:82
inet addr:10.10.10.10 Bcast:10.10.10.15 Mask:255.255.255.248
inet6 addr: fe80::216:3eff:fe29:5a82/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:2522216 errors:0 dropped:0 overruns:0 frame:0
TX packets:61813 errors:0 dropped:0 overruns:0 ...

Red5 is an Open Source Flash Server written in Java that supports:
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 Stream Publishing
Remoting
Protocols: RTMP, RTMPT, RTMPS, and RTMPE

As Red5 is written in Java, let`s install it on the server:

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yum install java-1.6.0-openjdk.x86_64  java-1.6.0-openjdk-devel.x86_64

Ant is needed to compile RED5 code. Ant comes in binary form, so we`ll ...

Found useful for myself the following CLI utility: column.
Just compare the user friendliness of the following output:
# cat /proc/mounts
rootfs / rootfs rw 0 0
proc /proc proc rw,relatime 0 0
sysfs /sys sysfs rw,nosuid,nodev,noexec,relatime 0 0
udev /dev tmpfs rw,nosuid,relatime,size=10240k,mode=755 0 0
devpts /dev/pts devpts rw,relatime,gid=5,mode=620 0 0
/dev/sdb3 / ext4 rw,noatime,user_xattr,acl,barrier=1,data=ordered 0 0
tmpfs /run tmpfs rw,nosuid,nodev,relatime,mode=755 0 0
rc-svcdir /lib64/rc/init.d tmpfs rw,nosuid,nodev,noexec,relatime,size=1024k,mode=755 0 0
configfs /sys/kernel/config configfs rw,nosuid,nodev,noexec,relatime 0 0 ...