Display lP address of machine on the banner without login

Add following lines to /etc/rc.local:

# initial setup, cp /etc/issue /etc/issue.orig
cp /etc/issue.orig /etc/issue
ip addr|grep inet |grep -i enp|awk {'print $NF, $2'}|awk -F'/' {'print $1'} >> /etc/issue
echo "" >> /etc/issue

Install Python Packages without internet connection

Step 1: Install base packages from installation media (DVD)

[root@localhost pip-9.0.1]# yum install gcc python-devel python-setuptools

[root@localhost pip-9.0.1]# rpm -ql python-setuptools.noarch |grep easy_install.py
/usr/lib/python2.7/site-packages/easy_install.py
/usr/lib/python2.7/site-packages/easy_install.pyc
/usr/lib/python2.7/site-packages/easy_install.pyo
/usr/lib/python2.7/site-packages/setuptools/command/easy_install.py
/usr/lib/python2.7/site-packages/setuptools/command/easy_install.pyc
/usr/lib/python2.7/site-packages/setuptools/command/easy_install.pyo

Step 2: Install pip offline (Refer to step in appendix A to download pip-x.y.z.tar.gz)

[root@localhost pip-9.0.1]# python /usr/lib/python2.7/site-packages/easy_install.py ./pip-9.0.1.tar.gz
Processing pip-9.0.1.tar.gz
Writing /tmp/easy_install-LUeyTI/pip-9.0.1/setup.cfg
Running pip-9.0.1/setup.py -q bdist_egg --dist-dir /tmp/easy_install-LUeyTI/pip-9.0.1/egg-dist-tmp-8Ygk34
/usr/lib64/python2.7/distutils/dist.py:267: UserWarning: Unknown distribution option: 'python_requires'
  warnings.warn(msg)
warning: no previously-included files found matching '.coveragerc'
warning: no previously-included files found matching '.mailmap'
warning: no previously-included files found matching '.travis.yml'
warning: no previously-included files found matching '.landscape.yml'
warning: no previously-included files found matching 'pip/_vendor/Makefile'
warning: no previously-included files found matching 'tox.ini'
warning: no previously-included files found matching 'dev-requirements.txt'
warning: no previously-included files found matching 'appveyor.yml'
no previously-included directories found matching '.github'
no previously-included directories found matching '.travis'
no previously-included directories found matching 'docs/_build'
no previously-included directories found matching 'contrib'
no previously-included directories found matching 'tasks'
no previously-included directories found matching 'tests'
Adding pip 9.0.1 to easy-install.pth file
Installing pip script to /usr/bin
Installing pip2.7 script to /usr/bin
Installing pip2 script to /usr/bin

Installed /usr/lib/python2.7/site-packages/pip-9.0.1-py2.7.egg
Processing dependencies for pip==9.0.1
Finished processing dependencies for pip==9.0.1

Step 3: Install python packages (use ipython as example) (Refer to step in appendix B to download these package)

[root@localhost python]# ls -l ipython-deps/
total 2640
-rw-r--r--. 1 root root   6497 Dec  2 09:10 backports.shutil_get_terminal_size-1.0.0-py2.py3-none-any.whl
-rw-r--r--. 1 root root   9052 Dec  2 09:10 decorator-4.1.2-py2.py3-none-any.whl
-rw-r--r--. 1 root root  12427 Dec  2 09:10 enum34-1.1.6-py2-none-any.whl
-rw-r--r--. 1 root root 758874 Dec  2 09:10 ipython-5.5.0-py2-none-any.whl
-rw-r--r--. 1 root root  26343 Dec  2 09:10 ipython_genutils-0.2.0-py2.py3-none-any.whl
-rw-r--r--. 1 root root  16631 Dec  2 09:10 pathlib2-2.3.0-py2.py3-none-any.whl
-rw-r--r--. 1 root root  55699 Dec  2 09:10 pexpect-4.3.0-py2.py3-none-any.whl
-rw-r--r--. 1 root root   6864 Dec  2 09:10 pickleshare-0.7.4-py2.py3-none-any.whl
-rw-r--r--. 1 root root 247937 Dec  2 09:10 prompt_toolkit-1.0.15-py2-none-any.whl
-rw-r--r--. 1 root root  39072 Dec  2 09:10 ptyprocess-0.5.2-py2.py3-none-any.whl
-rw-r--r--. 1 root root 841734 Dec  2 09:10 Pygments-2.2.0-py2.py3-none-any.whl
-rw-r--r--. 1 root root  29670 Dec  2 09:10 scandir-1.6.tar.gz
-rw-r--r--. 1 root root 489406 Dec  2 09:10 setuptools-38.2.3-py2.py3-none-any.whl
-rw-r--r--. 1 root root  12663 Dec  2 09:10 simplegeneric-0.8.1.zip
-rw-r--r--. 1 root root  10702 Dec  2 09:10 six-1.11.0-py2.py3-none-any.whl
-rw-r--r--. 1 root root  74730 Dec  2 09:10 traitlets-4.3.2-py2.py3-none-any.whl
-rw-r--r--. 1 root root  21014 Dec  2 09:10 wcwidth-0.1.7-py2.py3-none-any.whl

# --no-index: Ignore package index (Base URL of Python Package Index), only looking at --find-links URLs instead

[root@localhost python]# pip install --no-index --find-links=ipython-deps/ ipython
Collecting ipython
Collecting prompt-toolkit<2.0.0,>=1.0.4 (from ipython)
Requirement already satisfied: decorator in /usr/lib/python2.7/site-packages (from ipython)
Collecting pexpect; sys_platform != "win32" (from ipython)
Collecting backports.shutil-get-terminal-size; python_version == "2.7" (from ipython)
Collecting setuptools>=18.5 (from ipython)
Collecting pygments (from ipython)
Collecting pathlib2; python_version == "2.7" or python_version == "3.3" (from ipython)
Collecting traitlets>=4.2 (from ipython)
Collecting simplegeneric>0.8 (from ipython)
Collecting pickleshare (from ipython)
Collecting wcwidth (from prompt-toolkit<2.0.0,>=1.0.4->ipython)
Collecting six>=1.9.0 (from prompt-toolkit<2.0.0,>=1.0.4->ipython)
Collecting ptyprocess>=0.5 (from pexpect; sys_platform != "win32"->ipython)
Collecting scandir; python_version < "3.5" (from pathlib2; python_version == "2.7" or python_version == "3.3"->ipython)
Collecting ipython-genutils (from traitlets>=4.2->ipython)
Collecting enum34; python_version == "2.7" (from traitlets>=4.2->ipython)
Installing collected packages: wcwidth, six, prompt-toolkit, ptyprocess, pexpect, backports.shutil-get-terminal-size, setuptools, pygments, scandir, pathlib2, ipython-genutils, enum34, traitlets, simplegeneric, pickleshare, ipython
  Found existing installation: setuptools 0.9.8
    Uninstalling setuptools-0.9.8:
       Successfully uninstalled setuptools-0.9.8
  Running setup.py install for scandir ... done
  Running setup.py install for simplegeneric ... done
Successfully installed backports.shutil-get-terminal-size-1.0.0 enum34-1.1.6 ipython-5.5.0 ipython-genutils-0.2.0 pathlib2-2.3.0 pexpect-4.3.0 pickleshare-0.7.4 prompt-toolkit-1.0.15 ptyprocess-0.5.2 pygments-2.2.0 scandir-1.6 setuptools-38.2.3 simplegeneric-0.8.1 six-1.11.0 traitlets-4.3.2 wcwidth-0.1.7
[root@localhost python]#

Step 4: Post Verification

[root@localhost python]# ipython
Python 2.7.5 (default, Aug  4 2017, 00:39:18)
Type "copyright", "credits" or "license" for more information.

IPython 5.5.0 -- An enhanced Interactive Python.
?         -> Introduction and overview of IPython's features.
%quickref -> Quick reference.
help      -> Python's own help system.
object?   -> Details about 'object', use 'object??' for extra details.

In [1]: quit

Appendix A: Download PIP (https://pypi.python.org/simple/pip/)

[root@localhost python]# curl -o pip-9.0.1.tar.gz https://pypi.python.org/packages/11/b6/abcb525026a4be042b486df43905d6893fb04f05aac21c32c638e939e447/pip-9.0.1.tar.gz#md5=35f01da33009719497f01a4ba69d63c9
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100 1169k  100 1169k    0     0   460k      0  0:00:02  0:00:02 –:--:--  460k

Appendix B: Download Packages and their dependencies

[root@localhost python]# pip download ipython -d ipython-deps
Collecting ipython
  Downloading ipython-5.5.0-py2-none-any.whl (758kB)
    100% |████████████████████████████████| 768kB 373kB/s
  Saved ./ipython-deps/ipython-5.5.0-py2-none-any.whl
Collecting prompt-toolkit<2.0.0,>=1.0.4 (from ipython)
  Downloading prompt_toolkit-1.0.15-py2-none-any.whl (247kB)
    100% |████████████████████████████████| 256kB 583kB/s
  Saved ./ipython-deps/prompt_toolkit-1.0.15-py2-none-any.whl
Collecting decorator (from ipython)
  Downloading decorator-4.1.2-py2.py3-none-any.whl
  Saved ./ipython-deps/decorator-4.1.2-py2.py3-none-any.whl
Collecting pexpect; sys_platform != "win32" (from ipython)
  Downloading pexpect-4.3.0-py2.py3-none-any.whl (55kB)
    100% |████████████████████████████████| 61kB 872kB/s
  Saved ./ipython-deps/pexpect-4.3.0-py2.py3-none-any.whl
Collecting backports.shutil-get-terminal-size; python_version == "2.7" (from ipython)
  Downloading backports.shutil_get_terminal_size-1.0.0-py2.py3-none-any.whl
  Saved ./ipython-deps/backports.shutil_get_terminal_size-1.0.0-py2.py3-none-any.whl
Collecting setuptools>=18.5 (from ipython)
  Downloading setuptools-38.2.3-py2.py3-none-any.whl (489kB)
    100% |████████████████████████████████| 491kB 658kB/s
  Saved ./ipython-deps/setuptools-38.2.3-py2.py3-none-any.whl
Collecting pygments (from ipython)
  Downloading Pygments-2.2.0-py2.py3-none-any.whl (841kB)
    100% |████████████████████████████████| 849kB 830kB/s
  Saved ./ipython-deps/Pygments-2.2.0-py2.py3-none-any.whl
Collecting pathlib2; python_version == "2.7" or python_version == "3.3" (from ipython)
  Downloading pathlib2-2.3.0-py2.py3-none-any.whl
  Saved ./ipython-deps/pathlib2-2.3.0-py2.py3-none-any.whl
Collecting traitlets>=4.2 (from ipython)
  Downloading traitlets-4.3.2-py2.py3-none-any.whl (74kB)
    100% |████████████████████████████████| 81kB 2.0MB/s
  Saved ./ipython-deps/traitlets-4.3.2-py2.py3-none-any.whl
Collecting simplegeneric>0.8 (from ipython)
  Downloading simplegeneric-0.8.1.zip
  Saved ./ipython-deps/simplegeneric-0.8.1.zip
Collecting pickleshare (from ipython)
  Downloading pickleshare-0.7.4-py2.py3-none-any.whl
  Saved ./ipython-deps/pickleshare-0.7.4-py2.py3-none-any.whl
Collecting wcwidth (from prompt-toolkit<2.0.0,>=1.0.4->ipython)
  Downloading wcwidth-0.1.7-py2.py3-none-any.whl
  Saved ./ipython-deps/wcwidth-0.1.7-py2.py3-none-any.whl
Collecting six>=1.9.0 (from prompt-toolkit<2.0.0,>=1.0.4->ipython)
  Downloading six-1.11.0-py2.py3-none-any.whl
  Saved ./ipython-deps/six-1.11.0-py2.py3-none-any.whl
Collecting ptyprocess>=0.5 (from pexpect; sys_platform != "win32"->ipython)
  Downloading ptyprocess-0.5.2-py2.py3-none-any.whl
  Saved ./ipython-deps/ptyprocess-0.5.2-py2.py3-none-any.whl
Collecting scandir; python_version < "3.5" (from pathlib2; python_version == "2.7" or python_version == "3.3"->ipython)
  Downloading scandir-1.6.tar.gz
  Saved ./ipython-deps/scandir-1.6.tar.gz
Collecting ipython-genutils (from traitlets>=4.2->ipython)
  Downloading ipython_genutils-0.2.0-py2.py3-none-any.whl
  Saved ./ipython-deps/ipython_genutils-0.2.0-py2.py3-none-any.whl
Collecting enum34; python_version == "2.7" (from traitlets>=4.2->ipython)
  Downloading enum34-1.1.6-py2-none-any.whl
  Saved ./ipython-deps/enum34-1.1.6-py2-none-any.whl
Successfully downloaded ipython prompt-toolkit decorator pexpect backports.shutil-get-terminal-size setuptools pygments pathlib2 traitlets simplegeneric pickleshare wcwidth six ptyprocess scandir ipython-genutils enum34

Expand OCRVOTE diskgroup size before upgrading to 12c

[root@rac01 ~]# oracleasm createdisk VOTE2 /dev/sdd1

Writing disk header: done

Instantiating disk: done

SQL> select path, name, header_status from v$asm_disk;

PATH                 NAME                           HEADER_STATU

-------------------- ------------------------------ ------------

ORCL:VOTE2                                          PROVISIONED

ORCL:DATA1           DATA1                          MEMBER

ORCL:FRA1            FRA1                           MEMBER

ORCL:VOTE1           VOTE1                          MEMBER

SQL> alter diskgroup OCRVOTE add disk 'ORCL:VOTE2' drop disk VOTE1;

Diskgroup altered.

SQL> select path, name, header_status from v$asm_disk;

PATH                 NAME                           HEADER_STATU

-------------------- ------------------------------ ------------

ORCL:VOTE1                                          FORMER

ORCL:DATA1           DATA1                          MEMBER

ORCL:FRA1            FRA1                           MEMBER

ORCL:VOTE2           VOTE2                          MEMBER

Quick guide: how to manage Redhat Cluster in RHEL 5

Check cluster status

[root@ncs-db-1 ~]# clustat
Cluster Status for ncs_dbcluster @ Wed Sep  1 15:22:08 2009
Member Status: Quorate

 Member Name                             ID   Status
 ------ ----                             ---- ------
 ncs-db-n1                                   1 Online, Local, rgmanager
 ncs-db-n2                                   2 Online, rgmanager

 Service Name                   Owner (Last)                   State
 ------- ----                   ----- ------                   -----
 service:clusvc                 ncs-db-n1                      started

Disable cluster status
After disable, resource group shutdown and will not affect by server reboot and/or failover.

[root@ncs-db-1 ~]# clusvcadm -d clusvc
Local machine disabling service:clusvc...Success

Enable cluster status

[root@ncs-db-1 ~]# clusvcadm -e clusvc
Local machine trying to enable service:clusvc...Success
service:clusvc is now running on ncs-db-n1

Freeze cluster resource group
After freeze resource group, it will not being monitored by the cluster manager. But current resource group state will not be affected by this command.

[root@ncs-db-1 ~]# clusvcadm -Z clusvc
Local machine freezing service:clusvc...Success

Unfreeze cluster resource group

[root@ncs-db-1 ~]# clusvcadm -U clusvc
Local machine unfreezing service:clusvc...Success

Stop cluster resource group
Resource group can failover if current node due to fencing.

[root@ncs-db-1 ~]# clusvcadm -s clusvc
Local machine stopping service:clusvc...Success

Restart cluster resource group
Resource group can failover if current node due to fencing.

[root@ncs-db-1 ~]# clusvcadm -s clusvc
Local machine stopping service:clusvc...Success

Relocate resource to another member in the failover domain

[root@ncs-db-1 ~]# clusvcadm -r clusvc -m ncs-db-n2
Trying to relocate service:clusvc to ncs-db-n2...Success
service:clusvc is now running on ncs-db-n2

Other useful commands

[root@ncs-db-1 ~]# ccs_tool lsnode

Cluster name: ncs_dbcluster, config_version: 21

Nodename                        Votes Nodeid Fencetype
ncs-db-n1                          1    1    ncs-db-1-ilo1
ncs-db-n2                          1    2    ncs-db-2-ilo2

[root@ncs-db-1 ~]# cman_tool status
Version: 6.1.0
Config Version: 21
Cluster Name: ncs_cluster
Cluster Id: 27444
Cluster Member: Yes
Cluster Generation: 1796
Membership state: Cluster-Member
Nodes: 2
Expected votes: 1
Total votes: 2
Quorum: 1
Active subsystems: 9
Flags: 2node Dirty
Ports Bound: 0 11 177
Node name: ncs-db-n1
Node ID: 1
Multicast addresses: xxx.xxx.xxx.xxx
Node addresses: xxx.xxx.xxx.xxx

How to differentiate RHEL releases correctly

Please take note, this artical is only focusing on Server relate product, not Desktop product.

Before RHEL5, we usually talked about AS & ES for server editions.

• AS: Red Hat Enterprise Linux AS ("advanced server")
• ES: Red Hat Enterprise Linux ES ("entry/mid server")

Key limitations with RHEL3 ES (kernel foundation Linux 2.4.21)

• Maximum 2 CPU sockets
• Maximum 8 GB RAM
• No support on IBM Power

Key limitations with RHEL4 ES (kernel foundation Linux 2.6.9)

• Maximum 2 CPU sockets
• Maximum 8 GB RAM
• No support on IBM Power

Start with RHEL 5, Redhat starts to use "RHEL" and "RHEL Advanced Platform" to replace "ES" & "AS".

Key limitations with RHEL5 (kernel foundation Linux 2.6.18)

• Maximum 2 CPU sockets
• Maximum 4 virtualized guests/instances
• No support for Storage virtualization (with Red Hat GFS and Cluster Suite)

Reference:

http://www.redhat.com/rhel/compare/

http://www.redhat.com/whitepapers/rhel/RHEL3FamOverWPSO.pdf

http://www.tips5.com/difference-between-as-ws-es-and-desktop-of-redhat-enterprise-linux