— IT happens.
Notes on the CentOS7 flavor of Linux operating systems.
find /var/log/ -name '*.gz' -exec rm {} +
Note: Concluding with ‘+’ rather than ‘\;’ should be faster by not running rm on every instance from find.
find /var/log/ -name '*.gz' -exec rm -i {} +
find /var/log/ -name '*.gz' -exec rm -r {} +
find /var/log/ -name '*log' -type f -exec truncate -s 0 {} +
find /path/to/dir -empty -type d -delete
yum install firewalld systemctl start firewalld.service systemctl enable firewalld.service
firewall-cmd --permanent --new-zone=pci-web firewall-cmd --reload firewall-cmd --permanent --zone=pci-web --add-service=https firewall-cmd --permanent --zone=pci-web --add-service=ntp firewall-cmd --zone=pci-web --permanent --change-interface=eno1 firewall-cmd --permanent --new-zone=lcl-mgt firewall-cmd --reload firewall-cmd --permanent --zone=lcl-mgt --add-rich-rule 'rule family="ipv4" source address="172.16.0.0/12" service name="ssh" log prefix="ssh" level="info" limit value="1/m" accept' firewall-cmd --permanent --zone=lcl-mgt --change-interface=eno2
firewall-cmd --state firewall-cmd --zone=pci-web --list-all firewall-cmd --zone=lcl-mgt --list-all firewall-cmd --get-active-zones
yum install redis systemctl start redis systemctl enable redis
yum install rabbitmq-server systemctl start rabbitmq-server systemctl enable rabbitmq-server
rabbitmqctl add_vhost /sensu rabbitmqctl add_user sensu wh@t3v3r rabbitmqctl set_permissions -p /sensu sensu ".*" ".*" ".*"
rabbitmqctl list_exchanges -p /sensu
vim /etc/yum.repos.d/sensu.repo [+] [sensu]<br >name=sensu [+] baseurl=http://sensu.global.ssl.fastly.net/yum/$basearch/ [+] gpgcheck=0<br >enabled=1
yum install sensu systemctl start sensu-server systemctl start sensu-api systemctl start sensu-client systemctl enable sensu-server systemctl enable sensu-api systemctl enable sensu-client
yum install python-carbon pip install txAMQP
pip install graphite-api
wget https://www.python.org/ftp/python/3.6.0/Python-3.6.0.tgz tar xzvf Python-3.6.0.tgz cd Python-3.6.0 ./configure --prefix=/usr/local --enable-shared make make altinstall
In case of an error like this: “/usr/local/bin/python3.6: error while loading shared libraries: libpython3.6m.so.1.0: cannot open shared object file: No such file or directory“, do this:
vim /etc/ld.so.conf [+] /usr/local/lib ldconfig
/usr/local/bin/python3.6 -m venv /stuff/grafster/env36 source /stuff/grafster/env36/bin/activate pip install --upgrade pip
cd /stuff/downloads/mod_wsgi git pull ./configure --with-python=/stuff/wholebadgermilk/env36/bin/python make clean make make install
kill the host’s oldest session:
pkill -o -u YOURUSERNAME sshd
ps -ef | grep defunct | grep -v grep | cut -b8-20 | xargs kill -9
Starting with CentOS version 7, we need to install Unison from source:
yum install ocaml ocaml-camlp4-devel ctags ctags-etagswget https://www.seas.upenn.edu/~bcpierce/unison/download/releases/stable/unison-2.48.4.tar.gz cd src/ make cp -v unison /usr/local/sbin/
Unison project home page: www.cis.upenn.edu/~bcpierce/unison/download/releases/stable/unison-manual.html
Here’s how to add a secondary IP address to an existing network interface of a CentOS7 server. Don’t forget the config files — this won’t survive a reboot.
ip addr add 172.26.7.80/24 brd 172.26.7.255 dev team1 ip addr show team1
ip rule add from 172.26.7.80/32 table rt1 ip rule show
If you gotta roll it back:
ip addr del 172.26.7.80/24 dev team1 ip rule del from 172.26.7.80/32 table rt1