SSH - How it works : SSH client initiates connection. If it is first time then servers sends host key - verify and say YES OR NO. Once you accept it - SSH server sends the versions it supports, Encryption ( AES256, 3DES) and Hash techniques ( SHA, MD5 ) it supports. Client should agree … Continue reading Knowledge Article on SSH
Q: # df -h showing disk is not full but the processes not able to write files and failing. A: #df -i showed the inodes usage is 100% and in one of the log folders there are so many files so ran out of inodes. Moved the files to a temp folder archived to release … Continue reading More Disk Issues
Recently we have seen a production issue - received multiple alerts high disk I/O on a server where production DB is running. CPU and Memory still fine though.. No weird logs in messages OR database logs. # htop - shown multiple processes in "D" state. #iostat -xtc 1 100 , atop shown the disk utilization … Continue reading MySQL – High Disk I/O Issue
We are doing SSL offloading on public facing load balancer - recently received a request to not to allow weak SSL ciphers. If you go to the Load Balancer in question - Listerners section 2. SSL version, SSL Ciphers options can be changed
I've seen instances where instance is not registering to AWS ECS cluster. Check ECS agent running - "docker ps" if not then start it. Check if "ECS_CLUSTER=<cluster_name>" defined in /etc/ecs/ecs.config Remove the file if already exists in /var/lib/ecs/data/ecs_agent_data.json and restart the ECS agent - "restart ecs".
** This page is to capture the errors related to AWS ECS. It is not the complate list but I will update as I see further** Out of Memory Before Container Start: While running the "ecs-cli compose up" hit the error INFO Couldn't run containers reason=RESOURCE:MEMORY – Check the total memory of containers and check … Continue reading AWS ECS -Errors Ref
** This post is more of the issue I've seen with the setup in one of our environments than implementation**. So here is what happened. Issue: Accessing the URL ( lets say http://www.example.com ) is going to maintenance static page running in S3 but none of the nodes are offline. As in general we have … Continue reading AWS – Hosted site under maintenance