What every SRE should know about: #

GNU/Linux resolvers and Dual-Stack applications #

• What every SRE should know about GNU/Linux resolvers and Dual-Stack applications
• 1. What is a stub resolver?
• 2. History: gethostbyname() and old good friends
• 3. getaddrinfo() and POSIX spec
• 4. getaddrinfo() from glibc
• 5. getaddrinfo() from musl libc
• 6. Dual-Stack applications
• 7. Async non-blocking resolvers in C
• 8. Stub resolvers in languages
• 9. Dual-stack software examples
• 10. systemd-resolved
• 11. Querying Nameservers on dual-stack hosts
• 12. Present and future of resolvers and DNS related features
• Troubleshooting tools for resolvers and DNS

File descriptors, pipes, terminals, user sessions, process groups and daemons #

• 0. GNU/Linux shell related internals for SRE
• 1. File descriptor and open file description
• 2. Pipes
• 3. Process groups, jobs and sessions
• 4. Terminals and pseudoterminals

Linux Page Cache mini book #

• 0. Linux Page Cache for SRE
• 1. Prepare environment for experiments
• 2. Essential Page Cache theory
• 3. Page Cache and basic file operations
• 4. Page Cache eviction and page reclaim
• 5. More about mmap() file access
• 6. Cgroup v2 and Page Cache
• 7. How much memory my program uses or the tale of working set size
• 8. Direct IO (DIO)
• 9. Advanced Page Cache observability and troubleshooting tools