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Learning - AWS

Service Health Check  -------------- http://status.aws.amazon.com Region - Geographocal identify Region comprises of AV Zones AV Zone - AV zone comprises of physical infra (like DC, Network, Power, Physcial SErver, Stroage etc..) --------------------------- VPC - Virtual Private Cloud  - logically isolated on your network. Earlier : EC2-Classic - Comes with one single FLAT  N/W --------------- S3 - Simple Storage Service (ALL AMI  and Snapshot are Stored in S3 bucket )  EBS - Elastic Block Store - ( Where VOLUMES/Virtual Storage is created )  ( Root device type: ebs ) Virtualization type : hvm ( Hardware virutalization method ) Old method - Virtualization type : paravirtual. (  Instance Type -------------------------- General Purpose Compute Optimized GPU Instance Memory Optimized Storage Optimized -------------- A security group is a set of firewall rules that control the traffic for your instance.  you can add rules to allow specific traffic to reach your instance. There are Ingress(
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Learning Git

git config --global user.name  Yoganandhan Ganesan git config --global user.email gyoganandhan@gmail.com touch one.txt git status git add one.txt To remove the file in git  ------------------------------ git rm --cached one.txt To view the modified file difference  ------------------------------------ git diff To get the log ------------------- git log  git log --oneline --- git ignore file create ------------------------ touch .gitignore create branch -------------- git branch branch_name to change the branch ------------------- git checkout branch_name git checkout master ---------------- delete branch --------------- git branch -d branch_name ---------- to remvoe last commit  ------------------- git checkout . git checkout XXXXXX return to master with perivous position ----------------------------- git checkout master ------------------------------- we do not want to come pack to master ------------------------------------- git reset --hard ID(XXXXXX) git checkout master ( if you tr
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Apache Tomcat - User account details

To manage apache tomcat with jenkins.   <role rolename="tomcat"/>   <role rolename="role1"/>   <user  username="deployuser" password="deployuser" roles="manager-script" />   <user username="admin" password="admin" roles="manager-gui" />   <user username="tomcat" password="tomcat" roles="tomcat"/>   <user username="both" password="tomcat" roles="tomcat,role1"/>   <user username="role1" password="tomcat" roles="role1"/>   <role rolename="manager-gui"/>   <user username="tomcat" password="tomcat" roles="manager-gui"/> </tomcat-users>
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Veritas cluster Interview Questions-2

Please go through questions and answers. Let me know if you have any doubt by leaving comment. Adding and removing cluster node  Q-1 How to add a node in an existing cluster? Ans:    Adding a node into an existing cluster is a multi steps process. 1:       Set up the hardware Before adding a node to an existing cluster, node must be physically connected with the cluster.       1: Connect the VCS private Ethernet controllers       2: Connect the node to the shared storage 2:       Install the VCS software in the node           Install the VCS software and install the license. 3:       Configure LLT and GAB Create the LLT & GAB configuration files (/etc/llthosts, /etc/llttab and /etc/gabtab) in the new node and update the files on the existing node. 4:       Add the node to an existing cluster We have to perform below given tasks in any of the existing node of a cluster          1:Make to cluster configuration R/W           # haconf –makerw           2:Add the new node to the cl
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