To test a new logcheck rule, match it against a logfile:
sed -e 's/[[:space:]]*$//' /var/log/syslog | \
egrep '^\w{3} [ :0-9]{11} [._[:alnum:]-]+ crond\[[0-9]+\]: \(root\) CMD \(run-parts /etc/cron.(daily|hourly)\)'
Reference: README.logcheck-database
From within the project, execute:
git config remote.origin.url <new url>
If you get an error similar to the following when doing a “git pull” from the new origin:
You asked me to pull without telling me which branch you
want to merge with, and 'branch.master.merge' in
your configuration file does not tell me, either. Please
specify which branch you want to use on the command line and
try again (e.g. 'git pull <repository> <refspec>').
See git-pull(1) for details.
If you often merge with the same branch, you may want to
use something like the following in your configuration file:
[branch "master"]
remote = <nickname>
merge = <remote-ref>
[remote "<nickname>"]
url = <url>
fetch = <refspec>
See git-config(1) for details.
Then run:
git remote rm origin git remote add --track master origin <new url>
See also, if you’re renaming the origin you originally cloned from:
git branch --set-upstream master origin/master
Note: Much of this article is not original work, but came from the excellent support staff at Pogo Linux.
The IPMI interface on a SuperMicro X8DTH-6F motherboard (and presumably other SuperMicro motherboards) auto-selects between binding to the dedicated management port and the first port on the motherboard depending on whether the dedicated port is cabled or not. Switching between the ports requires a cold boot of the hardware:
If you are installing a 389 Directory Server instance on a headless (no X11) CentOS installation, you need extra font packages not included as 389 dependencies. (Otherwise, e.g. no text may appear when you launch “389-console”.) I verified this listing works; a subset may work, but I have not tested against one.
To convert an SSH key from SSH2-compatible format to OpenSSH-compatible, use the “-i” flag to “ssh-keygen”:
-i This option will read an unencrypted private (or public) key file in SSH2-compatible format and print an OpenSSH compatible private (or public) key to stdout. ssh-keygen also reads the RFC 4716 SSH Public Key File Format. This option allows importing keys from several commercial SSH implementations.
e.g.:
ssh-keygen -i -f user.ssh2.pub > user.ossh.pub
The best reference that I’m aware of for this used to be at http://sial.org/howto/sendmail/cipherlist/ – but DNS to that site is currently broken. The site can be reached by IP address, at least for the time being.
Distilled instructions:
APPENDDEF(`confENVDEF', `-D_FFR_TLS_1')
LOCAL_CONFIG O CipherList=DH
(Assuming, for whatever reasons, you want to limit ciphers to Diffie-Hellman varieties. Adjust as necessary.)
You can verify your CipherList values using OpenSSL:
> openssl ciphers DH ADH-AES256-SHA:DHE-RSA-AES256-SHA:DHE-DSS-AES256-SHA:ADH-AES128-SHA:DHE-RSA-AES128-SHA:DHE-DSS-AES128-SHA:ADH-DES-CBC3-SHA:ADH-DES-CBC-SHA:EXP-ADH-DES-CBC-SHA:ADH-RC4-MD5:EXP-ADH-RC4-MD5:EDH-RSA-DES-CBC3-SHA:EDH-RSA-DES-CBC-SHA:EXP-EDH-RSA-DES-CBC-SHA:EDH-DSS-DES-CBC3-SHA:EDH-DSS-DES-CBC-SHA:EXP-EDH-DSS-DES-CBC-SHA
Tested against Sendmail 8.14.1.
Use the “-l” flag to unzip:
> unzip -l Downloads/vijava2120100824.zip
Many more at 25 BEST SSH COMMANDS / TRICKS; three I didn’t know:
ssh-copy-id [-i [identity_file]] [user@]machine
ssh -t reachable_host ssh unreachable_host
(The -t flag is necessary to allocate a pseudo-tty.)
ssh root@example.com tshark -w - not tcp port 22 | wireshark -k -i -
or
ssh root@example.com tcpdump -U -w - not port 22 | wireshark -k -i -
(Of course, if you need to inspect SSH traffic, you’ll need to exclude the IP address of the local host running SSH from the remote tshark or tcpdump command. Also, the above assumes the use of SSH keypair authentication with the remote host – see Wireshark’s Pipes page for ideas if you need to enter a password on the command line.)
On the command line:
lpr -P printer-queue -o page-ranges=1-2 document.pdf
Reference: Command-Line Printing and Options
Convert an IP address to hex using the “gethostip” command:
$ gethostip 1.2.3.4 1.2.3.4 1.2.3.4 010203047
This is useful for naming files in a pxelinux.cfg directory, for instance.