Difference between revisions of "Centos7-RHEL9"
m (→Interfaces) |
m (→Interfaces) |
||
Line 28: | Line 28: | ||
* ens256 | * ens256 | ||
* ens161 | * ens161 | ||
+ | |||
+ | ==Default Route== | ||
+ | Temporary | ||
+ | $ route del default gw <default_gateway_ip> | ||
+ | $ route add default gw <default_gateway_ip> | ||
+ | |||
+ | Permanent /etc/sysconfig/network | ||
+ | GATEWAY=<new_default_gateway_ip> | ||
+ | |||
== Static Routes == | == Static Routes == |
Revision as of 06:02, 9 August 2020
Contents
Relationship with Fedora, Redhat
Fedora --> Redhat --> Centos, all run by the Redhat company.
- Fedora - Free - the main project, and it’s a communitity-based, free distro focused on quick releases of new features and functionality.
- Redhat - Paid - the corporate version based on the progress of that project, and it has slower releases, comes with support, and isn’t free.
- CentOS - Free - essentially the community version of Redhat. So it’s pretty much identical, but it is free and support comes from the community as opposed to Redhat itself.
Development
To make life super easy for the first cut of something
Disable firewall
service firewalld stop systemctl disable firewalld
Disable SELinux
/etc/selinux/config SELINUX=enforcing --> permissive Reboot
Interfaces
vi /etc/sysconfig/network-scripts/ifcfg-eth0
VM interfaces
VMWare interfaces are created in the following order
- ens192
- ens224
- ens256
- ens161
Default Route
Temporary
$ route del default gw <default_gateway_ip> $ route add default gw <default_gateway_ip>
Permanent /etc/sysconfig/network GATEWAY=<new_default_gateway_ip>
Static Routes
Temporary ip route add 172.16.5.0/24 via 10.0.0.101 dev eth0
ip route delete 192.168.0.0/16 dev ens256 scope link metric 1005
/etc/sysconfig/network-scripts/route-eth0
172.16.5.0/24 via 10.0.0.101 dev eth0
Remember to bounce the interface after
ifdown eth0 ifup eth0
Dummy Interface
$ cat /etc/modules-load.d/dummy.conf # Load dummy.ko at boot dummy $ cat /etc/modprobe.d/dummy.conf install dummy /sbin/modprobe --ignore-install dummy; /sbin/ip link set name ethdummy1 dev dummy0 $ cat /etc/sysconfig/network-scripts/ifcfg-ethdummy1 NAME=ethdummy1 DEVICE=ethdummy1 MACADDR=00:22:22:ff:ff:ff IPADDR=10.10.10.1 NETMASK=255.255.255.0 ONBOOT=yes TYPE=Ethernet NM_CONTROLLED=no
Optics Diagnostics
Output is similar to a Juniper
ethtool -m [interface]
Screen
Terminal multiplexer. https://linuxize.com/post/how-to-use-linux-screen/
Start a 'window' screen
or to give the session a name screen -S 'hello_world'
To exit exit [enter]
To detach from the session ctrl + a , d)
Show windows/terminals screen -ls
Re-attach screen -r [number or sesssion_name]
Scrollback start with -h [numlines]
to access - use copy mode
ctrl-A, Esacpe
, [then up/down], Escape
to return.
Locale Problems
This is an issue with Mobaxterm/WSL/Ubuntu not centos which sets the locale as C.UTF-8
, but here is a work around - add the following to your .bashrc file (seriously, there is something wrong with mobaxterm and this was the only fix (read: crude workaround)
export LANGUAGE=en_US.UTF-8 export LANG=en_US.UTF-8 export LC_ALL=en_US.UTF-8 export LC_CTYPE=en_US.UTF-8
Appears mobaxterm is built from cygwin sources which defaults to C.UTF-8 (which is an extended char set of en_US.UTF-8) - however some centos boxes do not know about the C variant so complain.
Normal fix (that Mobaxterm seems to ignore and set to C.UTF.8)
sudo locale-gen en_US.UTF-8 sudo update-locale LANG=en_US.UTF-8
Packages
list installed yum list installed
Remember to stop the service first :)
systemctl stop httpd
Add a specific package version
Show what versions are available
yum list httpd --showduplicates Loaded plugins: fastestmirror Loading mirror speeds from cached hostfile * base: mirror.xnet.co.nz * centos-sclo-rh: mirror.xnet.co.nz * centos-sclo-sclo: mirror.xnet.co.nz * epel: mirror.xnet.co.nz * extras: mirror.xnet.co.nz * remi-php73: mirrors.mediatemple.net * remi-safe: mirrors.mediatemple.net * updates: mirror.xnet.co.nz Available Packages httpd.x86_64 2.4.6-90.el7.centos base httpd.x86_64 2.4.41-4.codeit.el7
To install a particular one
sudo yum install httpd-2.4.6-90.el7.centos
Logging
To logs going to /var/log/messages for a particular service
sudo journalctl -u openli-provisioner.service
To watch a services logs
sudo journalctl --follow -u openli-provisioner.service
Firewall
firewall-cmd --zone=public --add-port=3000/tcp --permanent firewall-cmd --reload