Mail Basics — about MX records, A records, TXT records etc CF. MainEnable Setup Prerequisites >> - install software on a Master Server - Need A record of mail.Master Server - Need MX record of mail.Master Server - IIS needs to route traffic to the Master Server (for web console client)

Attaching EFS to Rocket Chat or MongoDB instance 1. Beware of the Security groups 2. Install yum install nfs-utils (to mount via nfs) - you can mount via nfs, efs helper(DNS), or by IP 3. execute command mount -t nfs4 -o XXXXX:/ /where/you/want/to/mount(inlocal) - to unmount umount /where/you/mounted/on/local * You…

First Create Active Directory in AWS - XXX.com (type in like a domain name) - 2 Availability zones Create Master Server EC2 add this computer to the domain ! ( System Properties > Computer Name Domain > Add the domain) - If cannot find domain -> need to add the…

How to check ports running (used ports) netstat -ab Cp command copy DIRECTORY/filename DIRECTORY/tofilename View file (=cat) type <filename> Set environment variable (export $XXX) for /f %i in (<command>, output) do setx RELEASE_VERSION=%i /M 2 commands at once - IF you want to run it tgt (without sequence) : <command> & <command> - IF you want to run it with sequence (Dependency) : <command> && <command>

In resource (EC2), you should provide securitygroupID, instead of actual securitygroup name → or will throw parameter group error If you launch AMI with Windows, the administrator password will be the same + also you will not be able to retrieve a new windows password AWS::CloudFormation::WaitCondition is to WAIT until the configuration stpes are done — before announcing the EC2 creation complete ! Must use together with WaitConditionHandler

AWS Secrets Manager → create the key — could be RDS, DynamoDB, or custom → Put in any <key> <value> pair How to access : 1. via program code ex. require(aws) 2. via CLI command line this will output a JSON format of file Prerequisite - aws configure (login to…

Cache vs Artifacts Cache are globally defined if you cache .m2/respository → all the later stages/jobs will have that repo by default Artifacts are defined within a “stage” if you make .m2/repository …

Standard process git status git add . git commit -m “new change” git push [repository name] How to push to branch git status lets you check which branch you’re on git branch OR git branch --list git branch june git checkout june How to pull ONLY a branch repo git clone -b june <repo url> If there is no “REMOTE” repository but have “local” repository will get error that there is no upstream branch git push --set-upstream origin[repositoryname] june

When your instance failes to create — Because they failed to create specific resources (security group, route53) — Because the success health check signal didn’t come through for a certain time → This doesn’t give you much info about error (Mostly because of Metadata(cfn-init) or UserData) Then How should we Troubleshoot? * Turn Off the “roll back function” - So we can go into the instance to troubleshoot → ‘Stack Creation Option’ : Rollback — disable (When launching template)