A Simple BBR Test on Linode

Mon, 10 Apr 2017 00:00:00 +0000

Overview:

TCP BBR solves two problems:

Fully utilizing bandwidth on network links with some packet loss. Suitable for high-latency, high-bandwidth network links.
Reducing buffer occupancy on network links, thereby lowering latency. Suitable for users with slow access networks.

I remember when BBR was first merged into the Linux 4.9 kernel in 2017, this congestion control algorithm proposed by Google was extremely popular in the tech community. At the time, I was doing cross-border file transfers on Linode, where packet loss was commonplace, so I wanted to test the results firsthand.

Monitoring Collection Notes

Mon, 20 Feb 2017 00:00:00 +0000

MySQL Monitoring

MySQL Privilege Best Practices

Privilege control is primarily for security reasons, so follow these best practices:

Grant only the minimum privileges needed to prevent users from doing harm. For example, if a user only needs to query, just grant SELECT privileges, not UPDATE, INSERT, or DELETE.
Restrict the login host when creating users, typically to a specific IP or internal network IP range.
Delete users without passwords after initializing the database. The installation automatically creates some users with no passwords by default.
Set passwords that meet complexity requirements for each user.
Periodically clean up unnecessary users. Revoke privileges or delete users.

Example:

Tcp on Mi&Bee Blog

A Simple BBR Test on Linode

Overview:

Monitoring Collection Notes

MySQL Monitoring

MySQL Privilege Best Practices