How to Install tmate slave on CentOS 6.6

###1- Install required packages for tmate and for compiling

Use group install for development tools. It will install all the following pakcages for you: autoconf automake binutils bison flex gcc gcc-c++ gettext libtool make patch pkgconfig redhat-rpm-config rpm-build rpm-sign

# yum groupinstall 'Development Tools'

Then install other required packages for tmate

# yum install git kernel-devel zlib-devel openssl-devel ncurses-devel cmake ruby libssh-devel wget

Check if libevent is installed and the version. We need libevent2

# rpm -qa | grep libevent
libevent-devel-1.4.13-4.el6.x86_64
libevent-doc-1.4.13-4.el6.noarch
libevent-headers-1.4.13-4.el6.noarch
libevent-1.4.13-4.el6.x86_64

If the version is older, remove it

yum remove libevent libevent-devel libevent-headers

Download libevent2

wget https://github.com/downloads/libevent/libevent/libevent-2.0.21-stable.tar.gz
tar xf libevent-2.0.21-stable.tar.gz
cd libevent-2.0.21-stable

Compile it and install

./configure && \
make && \
make install

Create a symbolic link if you are on a 64-bit server

ln -s /usr/local/lib/libevent-2.0.so.5 /usr/lib64/libevent-2.0.so.5

###2- Installing tmate-slave

Now download tmate-slave

git clone https://github.com/nviennot/tmate-slave.git

Change into the new directory and create the SSH keys

cd tmate-slave/

Save the 3x keys (dsa, rsa and ecdsa)

The key fingerprint is:

Install tmate-slave

./autogen.sh && \
./configure && \
make && \
make install

###2- Configure tmate-slave

setup tmate-slave user

useradd tmate-slave

setup tmate-slave config

mkdir /etc/tmate-slave

./create_keys.sh 
install -D -m 0700 -o tmate-slave -g root keys/* /etc/tmate-slave/keys
chmod 0700 keys

touch /var/log/tmate.log
chown tmate-slave /var/log/tmate.log

setcap CAP_SYS_ADMIN=ep /usr/local/bin/tmate-slave

###3- Starting tmate-slave

If SSH is running, select another port and start tmate

sudo -u tmate-slave /usr/local/bin/tmate-slave -k /etc/tmate-slave/keys -l /var/log/tmate.log -p 2222 &

###4- Configuring the client to use your server

Create $HOME/.tmate.conf with the following

set -g tmate-server-host "[your server FQDN]"
set -g tmate-server-port [server port]
set -g tmate-server-dsa-fingerprint   "dsa fingerprint"
set -g tmate-server-rsa-fingerprint   "rsa fingerprint"
set -g tmate-server-ecdsa-fingerprint "ecdsa fingerprint"
#set -g tmate-identity ""              # Can be specified to use a different SSH key