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Re: editing log files at post

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Jonathan Horne wrote:
unfortunately i dont know anything about awk and sed (which is pitiful considering my other experience), but i think this is likely the answer to my issues.

problem: servers are not compressing log files in /var/log, despite the fact that 'compress' exists in the logrotate.conf.


at the end of my kickstart .cfg file, i have a line (its actually the final line)

echo "compress" >> /etc/logrotate.conf
EOF

which causes my /etc/logrotate.conf to look like this:

[root@psl-sipas04 log]# cat /etc/logrotate.conf # see "man logrotate" for details
# rotate log files weekly
weekly

# keep 4 weeks worth of backlogs
rotate 4

# create new (empty) log files after rotating old ones
create

# uncomment this if you want your log files compressed
#compress

# RPM packages drop log rotation information into this directory
include /etc/logrotate.d

# no packages own wtmp -- we'll rotate them here
/var/log/wtmp {
    monthly
    minsize 1M
    create 0664 root utmp
    rotate 1
}

# system-specific logs may be also be configured here.
compress
[root@psl-sipas04 log]#


as you can see, the 'compress' is the last line of the .conf file. but despite the fact its there, the server(s) is not compressing the log riles upon rotation. ive been under the impression that the exitance of a 'compress' in the uncommented state would cause the behavior i want, but this appears to not be so (not sure why here, other research required).

im wondering if i use something other than echoing the compress to the end of the file, or if i use awk or sed to locate the...

#compress

and change it to...

compress

if that would help?

would anyone be able to help me with an example that would do this at the post of my kickstart, instead of just appending the 'compress' at the bottom/end of file?



According to the man page for logrotate:

Each configuration file can set global options (local definitions override global ones, and later definitions override earlier ones)

So, your compress is set globally and is probably being overridden in one of the /etc/logrotate.d/* files. You'll need to verify that compress is set appropriately there for the log files you care about.

Generally, I do

cp /etc/logrotate.conf /etc/logrotate.conf.dist

sed -e 's/^#compress/compress/' /etc/logrotate.conf.dist >/etc/logrotate.conf

chmod 644 /etc/logrotate.conf

the sed command should be all on one line in your script.

Be warned that if you leave *.dist files in /etc/logrotate.d/ they will get processed as well. I generally copy them to /root/ before doing the sed command.

Hugh

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