Tag: hack
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stupid docker tricks #239192
1) Limit max processes on container; unfortunately docker seems intent on me not doing docker stupid tricks, so this is actually a bit of a pain on some systems… but if you figure out/etc/security/limits.conf, or can use prlimit (or write your own; use RLIMIT_NPROC instead of RLIMIT_NOFILE), you can do “prlimit –pid 666 –nproc=3:3” to limit the processes…
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HP firmware disks
I’d been playing with them… and since I hadn’t seen this anywhere I’ll put it as a small hack o the day. The disks do what they say (e.g. … install firmware ;)) – basically you burn it to a cd, boot it up, and it has some sort of access to the system. Since…
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lsof lite (III/III)
Finally one that looks at a process and tells you what ports its listening to. WPCM450 /tmp]$ ps |grep ssh 1263 root 4532 S /sbin/sshd -g 60 9730 root 9412 S sshd: root@pts/0 10571 root 3556 R grep ssh [WPCM450 /tmp]$…
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lsof lite (II/III)
Here’s one that looks up processes that have a file open… well, actually, more like a file expression; “foo” would match “/bar/foo” and “/foo/bar” (by intent), so use full paths if you’re not feeling frisky. And yes… busybox really does have that many duplicate processes with that file open…. [WPCM450 /tmp]$ ./lsof-pid-on-file.sh NVRAM_PrivateStorage00.dat /bin/fullfw …
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lsof lite I/III
After beating on some really anemic linux installations that had… well, just about nothing installed (one didn’t have “tr”, one didn’t have “df”, etc… come on, that’s pretty sad ;)), I decided to start writing some shell scripts in very, very basic shell (you can do a lot with shell, awk, and sed!) Here’s one…
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reading wtmp
Have a wtmp file you need read? A nice perl one liner to do so: perl -we ‘@type=("Empty","Run Lvl","Boot","New Time","Old Time","Init","Login","Normal","Term","Account");$recs = ""; while (<>) {$recs .= $_};foreach (split(/(.{384})/s,$recs)) {next if length($_) == 0;my ($type,$pid,$line,$inittab,$user,$host,$t1,$t2,$t3,$t4,$t5) = $_ =~/(.{4})(.{4})(.{32})(.{4})(.{32})(.{256})(.{4})(.{4})(.{4})(.{4})(.{4})/s;if (defined $line && $line =~ /\w/) {$line =~ s/\x00+//g;$host =~ s/\x00+//g;$user =~ s/\x00+//g;printf("%s %-8s %-12s %10s %-45s\n",scalar(gmtime(unpack("I4",$t3))),$type[unpack("I4",$type)],$user,$line,$host)}}print"\n"’…