Solaris process debugging: Difference between revisions
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==Swap usage per process== | ==Swap usage per process== | ||
< | <syntaxhighlight lang=awk> | ||
# pgrep . | xargs -n 1 pmap -S 2>/dev/null | nawk ' | # pgrep . | xargs -n 1 pmap -S 2>/dev/null | nawk ' | ||
function kb2h(value){ | function kb2h(value){ | ||
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==Set the core file size limit on a process== | ==Set the core file size limit on a process== | ||
For example for the sshd (and all resulting childs from now): | For example for the sshd (and all resulting childs from now): | ||
< | <syntaxhighlight lang=bash> | ||
ssh-server# prctl -n process.max-core-size -v 2g -t privileged -r -e deny $(pgrep -u root -o sshd) | ssh-server# prctl -n process.max-core-size -v 2g -t privileged -r -e deny $(pgrep -u root -o sshd) | ||
</source> | </source> | ||
Check: | Check: | ||
< | <syntaxhighlight lang=bash> | ||
ssh-server# prctl -n process.max-core-size $(pgrep -u root -o sshd) | ssh-server# prctl -n process.max-core-size $(pgrep -u root -o sshd) | ||
process: 1491: /usr/lib/ssh/sshd | process: 1491: /usr/lib/ssh/sshd | ||
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Now all processes (for example new logged in users) will have a core file size limit of 2GB... really? No! | Now all processes (for example new logged in users) will have a core file size limit of 2GB... really? No! | ||
< | <syntaxhighlight lang=bash> | ||
ssh-client# ssh ssh-server | ssh-client# ssh ssh-server | ||
ssh-server# ulimit -Ha | grep core | ssh-server# ulimit -Ha | grep core | ||
Revision as of 16:20, 25 November 2021
Swap usage per process
<syntaxhighlight lang=awk>
- pgrep . | xargs -n 1 pmap -S 2>/dev/null | nawk '
function kb2h(value){
unit=1;
while(value>=1024){
unit++;
value/=1024;
};
split("KB,MB,GB,TB,PB", unit_string, /,/);
return sprintf("%7.2f %s",value,unit_string[unit]);
}
/[0-9]+:/ {
pid=$1;
prog=$2;
}
/^total/{
swap_total+=$3;
printf ("%s\t%s\t%s\n",pid,kb2h($3),prog);
}
END{
printf "Total:\t%s\n",kb2h(swap_total);
}'
</source>
Set the core file size limit on a process
For example for the sshd (and all resulting childs from now): <syntaxhighlight lang=bash> ssh-server# prctl -n process.max-core-size -v 2g -t privileged -r -e deny $(pgrep -u root -o sshd) </source>
Check: <syntaxhighlight lang=bash> ssh-server# prctl -n process.max-core-size $(pgrep -u root -o sshd) process: 1491: /usr/lib/ssh/sshd NAME PRIVILEGE VALUE FLAG ACTION RECIPIENT process.max-core-size
privileged 2.00GB - deny -
system 8.00EB max deny -
</source>
Now all processes (for example new logged in users) will have a core file size limit of 2GB... really? No! <syntaxhighlight lang=bash> ssh-client# ssh ssh-server ssh-server# ulimit -Ha | grep core core file size (blocks, -c) 2097152 </source>
See what it says: blocks <-- !!! From man page: -c Maximum core file size (in 512-byte blocks)
