Installing OMS on CentOS 5.11

If your migrating old workloads to Azure occasionally you may not be able to use the latest Operating Systems. In these circumstances it may be useful to still be able to use the OMS agent to monitor your VM.

For CentOS – you really need to get to version 5.8 or above which has native support for Hyper-V, the Hypervisor that runs under the covers on Azure

Fix the CentOS repos to get the last released patches:

# cd /etc/yum.repos.d

edit CentOS-Base.repo and comment mirror list – change baseurl to start:

baseurl=http://vault.centos.org/5.11/
#mirrorlist=http://mirrorlist.centos.org/?release=$releasever&arch=$basearch&repo=updates
baseurl=http://vault.centos.org/5.11/updates/$basearch/

set the date correctly & hostname ip in /etc/hosts

Get the repo for syslog (needed later) 

# cd /etc/yum.repos.d
# wget http://rpms.adiscon.com/v8-stable/rsyslog.repo

Update the OS and install required software

# yum update
# yum groupinstall “Development Tools”
# yum groupinstall “Development Libraries”
# yum install python-ctypes
# yum install rsyslog

Update openssl (for TLS 1.2 support)

# wget https://www.openssl.org/source/openssl-1.0.2o.tar.gz  —no-check-certificate
# tar -zxvf openssl-*.tar.gz
# cd openssl-*
# ./config -fpic shared && make && make install
# echo “/usr/local/ssl/lib” >> /etc/ld.so.conf$ ldconfig

Install updated version of wget

# wget http://ftp.gnu.org/gnu/wget/wget-1.19.5.tar.gz –no-check-certificate
# tar -xzvf wget-1.19.5.tar.gz
# cd wget-1.19.5
# make clean
# ./configure –with-ssl=openssl –with-libssl-prefix=/usr/local/ssl
# make && make install
# yum -y remove wget
# mv /usr/bin/wget /usr/bin/wget.orig
# ln -s /usr/local/bin/wget /usr/bin/wget

Install Updated version of Python

need late 2.7 (2.7.15) to support tls1.2

# wget https://www.python.org/ftp/python/2.7.15/Python-2.7.15.tgz –no-check-certificate
# export CCFLAGS=”-I/usr/local/ssl/include/openssl”
# export LD_LIBRARY_PATH=”/usr/local/ssl/lib/”
# export LDFLAGS=”-L/usr/local/ssl/lib”
# make clean
# ./configure  –with-ensurepip=install –prefix=/usr/local

The final result of ./configure –prefix=$DEPLOY may looks like follows:

Python build finished, but the necessary bits to build these modules were not found:
_tkinter           bsddb185           dl
gdbm               imageop            sunaudiodev

To find the necessary bits, look in setup.py in detect_modules() for the module’s name.
It will show you the modules that can not be build, note that some of them are unnecessary or deprecated:
 
_tkinter: For tkinter graphy library, unnecessary if you don’t develop tkinter programs.
bsddb185: Older version of Oracle Berkeley DB. Undocumented. Install version 4.8 instead.
dl: For 32-bit machines. Deprecated. Use ctypes instead.
imageop: For 32-bit machines. Deprecated. Use PIL instead.
sunaudiodev: For Sun hardware. Deprecated

# make
# make altinstall

Check we have TLS 1.2 support

# python2.7
>>> import ssl
>>> print ssl.OPENSSL_VERSION
1.0.2

# pip2.7 uninstall cryptography
# pip2.7 install cryptography

Setup the python virtual environment

#/usr/local/bin/easy_install-2.7 virtualenv
# mkdir -p va/oms
# virtualenv va/oms
# cd va/oms/bin
# source activate

edit /etc/sysconfig/selinux
disabled

# wget https://github.com/Microsoft/OMS-Agent-for-Linux/releases/download/OMSAgent_v1.6.0-42/omsagent-1.6.0-42.universal.x64.sh –no-check-certificate

# ./omsagent-1.6.0-42.universal.x64.sh –install

(oms) [root@localhost bin]# ./omsadmin.sh -w 2 -s
………….
Starting Operations Management Suite agent (
info      Configured omsconfig

Start OMS and check the logs for any problems

# /opt/microsoft/omsagent/bin/service_control restart
# tail -100 /var/opt/microsoft/omsagent/log/omsagent.log

clearing selinux messages:

# audit2allow -a
# audit2allow -a -M myallow
# semodule -i myallow.pp

Install updated curl Package

# mkdir ~/src/$ cd ~/src/
This installs curl in /usr/local/bin/curl
# cd /root/src$ wget http://curl.haxx.se/download/curl-7.42.1.tar.gz
# tar -xzvf curl-*.tar.gz
# cd curl-*
# ./configure –with-ssl=/usr/local/ssl –disable-ldap && make && make install

Install updated openssh

# wget https://mirror.bytemark.co.uk/pub/OpenBSD/OpenSSH/portable/openssh-7.7p1.tar.gz –no-check-certificate
# ./configure –with-ssl-dir=/usr/local/ssl
# make
# make install

Install Azure waagent

# wget https://github.com/Azure/WALinuxAgent/archive/master.zip
(oms) python setup.py install –register-service
# more /usr/lib/systemd/system/waagent.service
# python -u /usr/sbin/waagent -daemon

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