checking ulimit
To check ulimit (which generally causes too many files open error), don’
Engineering👨💻
All about engineering - philosophy, opinions, best practices, approaches, tutorials. No code, mostly.
Edit file vi, not opened by sudo
Opened a file in vi without sudo. Edited some stuff, realized you
Debugging git slowness
Here's the command to understand where is it running slow and what's
Deleting a node from Chef
On workstation
knife node delete --yes NODENAME
knife client delete --yes NODENAME
mysql config check
mysqld --help --verbose will show variables that'd be loaded if process mysqld
mysql reset root password
sudo service mysqld stop
sudo su - mysql
/usr/sbin/mysqld --skip-grant-tables
Migrate mysql with minimal downtime
1. Login to existing mysql server.
2. Change the configuration /etc/my.
Change log from git commits
Git commits aren't the perfect way to communicate change logs, however it
Amazon EBS backup + LVM
No-nonsense steps:
Backup mechanism:
1. Tag volumes of the attached instance with
Debugging Connections
To find number of unique connections per IP address, sorted from max
Setting AWS Cloudwatch alarms
aws cloudwatch put-metric-alarm --alarm-name "application-name-cpu"
--metric-name CPUUtilization --namespace AWS/EC2 --statistic Average
Debugging Disk space
To find top 10 files eating up disk space
-- du -kh