[201811] disk_check.py: Allow remote user access when disk is read-only #1873
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What I did There is a bug that occasionally turn root-overlay as RO. This makes /etc & /home as RO. This blocks any new remote user login, as that needs to write into /etc & /home. This tool scans /etc & /home (or given dirs) as in RW or RO state. If RO, it could create a writable overlay using tmpfs. This is transient and stays until next reboot. Any write after the overlay will be lost upon reboot. But this allows new remote users login. How I did it Create upper & work dirs in /run/mount (tmpfs). Mount /etc & /home as lowerdirs and use the same name for final merge. This allows anyone opening a file in /etc or /home to operate on the merged overlay, transparently. How to verify it Mount any dir on tmpfs ( mount -t tmpfs tmpfs test_dir) remount as RO (mount -o remount,ro test_dir) Pass that dir to this script. (disk_check.py -d ./test_dir) Now it should be RW
1) Set default loglevel to SYSLOG_ERR 2) Make log level configurable via args
…1747) What I did Have independent subdirs for each mounted dir to avoid any collisions of files/dirs by same name. Adopt for older version of python3 How I did it Changes: Individual subdirs for each dir to be mounted subprocess args made compatible with older version of python3 (tested in version 3.5.3) How to verify it Simulate read-only state Run this script Test ssh via new tacacs user (who had not logged in earlier)
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@renukamanavalan please elaborate how your tested this change? |
yxieca
changed the title
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Manually copied the disk_check.py onto device running 201811 at /usr/local/bin/. |
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yxieca
approved these changes
Oct 15, 2021
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What I did
How I did it
Cherry pick PR #1569, #1736 & #1747
How to verify it
Previous command output (if the output of a command-line utility has changed)
New command output (if the output of a command-line utility has changed)