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June Chung
June Chung

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May 27, 2021

Basic Linux

hey

1 min read

1 min read


Feb 2, 2021

Mail Basics

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)

1 min read

1 min read


Jan 28, 2021

All About RocketChat

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…

1 min read

1 min read


Jan 14, 2021

Active Directory (AD)

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…

2 min read

Active Directory (AD)
Active Directory (AD)

2 min read


Dec 10, 2020

Windows Basic Command

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>

1 min read

1 min read


Dec 10, 2020

Cloudformation-Facts(troubleshooting guide)

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

1 min read

1 min read


Dec 3, 2020

Gitlab-3 (AWS secret access)

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…

1 min read

1 min read


Nov 25, 2020

Gitlab-2

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 …

1 min read

Gitlab-2
Gitlab-2

1 min read


Nov 23, 2020

Git Basic Commands

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

1 min read

1 min read


Nov 10, 2020

Cloud Formation — Troubleshooting

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)

1 min read

1 min read

June Chung

June Chung

1 Follower

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