SysAdmin | Luis Cacho

cURL to a specific target hostname

Fri, 23 Jun 2023 00:00:00 +0000

# Mockup command
curl -kv -H "Host: <target hostname>" <protocol>://<server ip address>:<port>

# Example command
curl -kv -H "Host: myapp.apps.example.com" https://152.10.10.1:443

Fix a borg lock issue

Fri, 23 Jun 2023 00:00:00 +0000

When you get the error:

# Example command

# ERROR output
borg info ssh://asdbqw55@a3rbqwrx.repo.borg.com/./repo
Enter passphrase for key ssh://asdbqw55@a3rbqwrx.repo.borg.com/./repo:
Failed to create/acquire the lock /Users/lcacho/.cache/borg/34961807af9e356640e09e9973ef4664598ee6706e4c2bccc4b2770c15e09d2b/lock.exclusive (timeout).

# Fix
borg break-lock ssh://asdbqw55@a3rbqwrx.repo.borg.com/./repo

References:

¹ Borg Break Lock

https://borgbackup.readthedocs.io/en/stable/usage/lock.html#borg-break-lock ↩︎

Python Alternatives in RHEL based OS

Thu, 22 Jun 2023 00:00:00 +0000

# To configure the unversioned `python` command to Python 3.11

alternatives --set python /usr/bin/python3.11

# To configure the unversioned `python` command to Python 2

alternatives --set python /usr/bin/python2

References:

¹Configure python on RHEL8

https://access.redhat.com/solutions/5380941 ↩︎

Change the field separator in awk

Thu, 19 Aug 2021 00:00:00 +0000

awk -F ":" '{print $1}'

# or if you want to do it programatically

awk 'BEGIN { FS=":" } { print $1 }'

# or you can also use a regular expression as a field separator.
# The following will print "bar" by using a regular expression to set the number "10" as a separator.

echo "foo 10 bar" | awk -F'[0-9][0-9]' '{print $2}'

MySQL Database Size

Fri, 06 Aug 2021 00:00:00 +0000

SELECT table_schema AS "Database",
ROUND(SUM(data_length + index_length) / 1024 / 1024, 2) AS "Size (MB)"
FROM information_schema.TABLES
GROUP BY table_schema;

AIX Tunning commands

Sun, 01 Aug 2021 00:00:00 +0000

no -a > no.txt
vmo -L > vmo.txt
ioo -L > ioo.txt