June ChungMail BasicsMail Basics — about MX records, A records, TXT records etc1 min read·Feb 2, 2021----
June ChungAll About RocketChatAttaching EFS to Rocket Chat or MongoDB instance 1. Beware of the Security groups 2. Install yum install nfs-utils (to mount via nfs) …1 min read·Jan 28, 2021----
June ChungActive Directory (AD)First Create Active Directory in AWS - XXX.com (type in like a domain name) - 2 Availability zones2 min read·Jan 14, 2021----
June ChungWindows Basic CommandHow to check ports running (used ports) netstat -ab1 min read·Dec 10, 2020----
June ChungCloudformation-Facts(troubleshooting guide)In resource (EC2), you should provide securitygroupID, instead of actual securitygroup name → or will throw parameter group error1 min read·Dec 10, 2020----
June ChungGitlab-3 (AWS secret access)AWS Secrets Manager → create the key — could be RDS, DynamoDB, or custom → Put in any <key> <value> pair1 min read·Dec 3, 2020----
June ChungGit Basic CommandsStandard process git status git add . git commit -m “new change” git push [repository name]1 min read·Nov 23, 2020----
June ChungCloud Formation — TroubleshootingWhen your instance failes to create — Because they failed to create specific resources (security group, route53) — Because the success…1 min read·Nov 10, 2020----