How do I increase the kernel log ring buffer size?

Solution Verified - Updated -

Issue

  • How do I increase the kernel log ring buffer size?
  • Why are boot messages missing from the logs?
  • A lot of boot messages are missing from the logs.
  • The dmesg file does not contain all the log messages from boot.
  • I need to troubleshoot the boot process but some of the boot messages are missing.

Environment

  • Red Hat Enterprise Linux 9
  • Red Hat Enterprise Linux 8
  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 6
  • Red Hat Enterprise Linux 5

Subscriber exclusive content

A Red Hat subscription provides unlimited access to our knowledgebase, tools, and much more.

Current Customers and Partners

Log in for full access

Log In

New to Red Hat?

Learn more about Red Hat subscriptions

Using a Red Hat product through a public cloud?

How to access this content