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Diffstat (limited to 'doc/administration/troubleshooting/linux_cheat_sheet.md')
| -rw-r--r-- | doc/administration/troubleshooting/linux_cheat_sheet.md | 26 |
1 files changed, 22 insertions, 4 deletions
diff --git a/doc/administration/troubleshooting/linux_cheat_sheet.md b/doc/administration/troubleshooting/linux_cheat_sheet.md index c61a78624c3..c4e991ccc1b 100644 --- a/doc/administration/troubleshooting/linux_cheat_sheet.md +++ b/doc/administration/troubleshooting/linux_cheat_sheet.md @@ -55,7 +55,7 @@ chown root:git <file_or_dir> chmod u+x <file> ``` -### Files & Dirs +### Files and directories ```shell # create a new directory and all subdirectories @@ -202,7 +202,7 @@ or you can build it from source if you have the Rust compiler. First run the tool with no arguments other than the strace output filename to get a summary of the top processes sorted by time spent actively performing tasks. You -can also sort based on total time, # of syscalls made, PID #, and # of child processes +can also sort based on total time, # of system calls made, PID #, and # of child processes using the `-S` or `--sort` flag. The number of results defaults to 25 processes, but can be changed using the `-c`/`--count` option. See `--help` for full details. @@ -220,7 +220,7 @@ Top 25 PIDs ... ``` -Based on the summary, you can then view the details of syscalls made by one or more +Based on the summary, you can then view the details of system calls made by one or more processes using the `-p`/`--pid` for a specific process, or `-s`/`--stats` flags for a sorted list. `--stats` takes the same sorting and count options as summary. @@ -266,7 +266,7 @@ Rough numbers for calls to `open` and `openat` (used to access files) on various Slow storage can cause the dreaded `DeadlineExceeded` error in Gitaly. Also [see this entry](../operations/filesystem_benchmarking.md) -in the handbook for quick tests customers can perform to check their filesystem performance. +in the handbook for quick tests customers can perform to check their file system performance. Keep in mind that timing information from `strace` is often somewhat inaccurate, so small differences should not be considered significant. @@ -304,6 +304,24 @@ whois <ip_address> | grep -i "orgname\|netname" # Curl headers with redirect curl --head --location "https://example.com" + +# Test if a host is reachable on the network. `ping6` works on IPv6 networks. +ping example.com + +# Show the route taken to a host. `traceroute6` works on IPv6 networks. +traceroute example.com +mtr example.com + +# List details of network interfaces +ip address + +# Check local DNS settings +cat /etc/hosts +cat /etc/resolv.conf +systemd-resolve --status + +# Capture traffic to/from a host +sudo tcpdump host www.example.com ``` ## Package Management |