disk_check: Check & mount RO as RW using tmpfs #1569
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If RO, create a writable overlay using tmpfs. This allows new remote TACACS users login, by ensuring /etc & /home are writable.
4 tasks
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Fixing unit test failure. |
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@qiluo-msft, can you review? |
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No logical code changes.
print to stderr & mock log function. No logical code changes.
qiluo-msft
approved these changes
Apr 26, 2021
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daall
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Apr 29, 2021
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
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@renukamanavalan please create PR for 201911 as difference in python2 vs python3. Cherry-pick is not recommended here. |
gitsabari
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Jun 15, 2021
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
qiluo-msft
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Aug 14, 2021
This reverts commit 9dba93f.
renukamanavalan
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Oct 11, 2021
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
renukamanavalan
added a commit
to renukamanavalan/sonic-utilities
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Oct 11, 2021
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
yxieca
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this pull request
Oct 15, 2021
…ly (#1873) * disk_check: Check & mount RO as RW using tmpfs (#1569) 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 * disk_check updates: (#1736) 1) Set default loglevel to SYSLOG_ERR 2) Make log level configurable via args * disk_check: Script updated to run good in 201811 & 201911 (#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)
abdosi
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Nov 20, 2021
* disk_check: Check & mount RO as RW using tmpfs (#1569) 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
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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
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)