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abstract:zfs-snapshots [2019/03/15 17:15] frey [Accessing a snapshot] |
abstract:zfs-snapshots [2019/03/15 17:18] (current) frey [Accessing a snapshot] |
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| ===== Accessing a snapshot ===== | ===== Accessing a snapshot ===== | ||
| - | Each snapshot under ''.zfs/snapshot'' is itself a directory, which can be navigated from the filesystem using the standard Linux file system commands (like ''cd'' and ''ls''). The files and directories present in the snapshot cannot be modified (''rm'' and ''mv'' will not work, neither will attempts to edit files in place), but they can be read (e.g. with ''less'' or ''head'') or copied: | + | Each snapshot under ''.zfs/snapshot'' is itself a directory, which can be navigated from the filesystem using the standard Linux file system commands (like ''cd'' and ''ls''). The files and directories present in the snapshot cannot be modified (''rm'' and ''mv'' will not work, neither will attempts to edit files in place), but they can be read (e.g. with ''less'' or ''head'') |
| <code bash> | <code bash> | ||
| [frey@login00 ~]$ ls -l ~/trace.txt | [frey@login00 ~]$ ls -l ~/trace.txt | ||
| Line 47: | Line 46: | ||
| -rw-r--r-- 1 frey everyone 336436 Jan 25 09:39 /home/1001/.zfs/snapshot/20190206-0115/trace.txt | -rw-r--r-- 1 frey everyone 336436 Jan 25 09:39 /home/1001/.zfs/snapshot/20190206-0115/trace.txt | ||
| [frey@login00 ~]$ head -5 ~/.zfs/snapshot/20190206-0115/trace.txt | [frey@login00 ~]$ head -5 ~/.zfs/snapshot/20190206-0115/trace.txt | ||
| - | 23128 execve("/opt/shared/lumerical-fdtd/2019a-R1/bin/fdtd-config-license", ["fdtd-config-license"], [/* 45 vars */]) = 0 | + | # |
| - | 23128 brk(NULL) = 0x1400000 | + | # This file contains a code trace |
| - | 23128 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x2b82dd5d4000 | + | # from a run of my program that is |
| - | 23128 readlink("/proc/self/exe", "/opt/shared/lumerical-fdtd/2019a"..., 4096) = 59 | + | # failing... |
| - | 23128 access("/etc/ld.so.preload", R_OK) = -1 ENOENT (No such file or directory) | + | # |
| + | </code> | ||
| + | or copied to some writable location using ''cp'' | ||
| + | <code bash> | ||
| [frey@login00 ~]$ cp -a ~/.zfs/snapshot/20190206-0115/trace.txt ~/trace.txt | [frey@login00 ~]$ cp -a ~/.zfs/snapshot/20190206-0115/trace.txt ~/trace.txt | ||
| [frey@login00 ~]$ ls -l ~/trace.txt | [frey@login00 ~]$ ls -l ~/trace.txt | ||
| -rw-r--r-- 1 frey everyone 336436 Jan 25 09:39 /home/1001/trace.txt | -rw-r--r-- 1 frey everyone 336436 Jan 25 09:39 /home/1001/trace.txt | ||
| + | [frey@login00 ~]$ head -5 ~/trace.txt | ||
| + | # | ||
| + | # This file contains a code trace | ||
| + | # from a run of my program that is | ||
| + | # failing... | ||
| + | # | ||
| </code> | </code> | ||