Moving redhat7 FC boot LUN from single path to multipath

-
This is quite possible that you install your Redhat 7 / Centos7 on a single path disk i.e. /dev/sda

Now your storage engineer enabled all path and you need to enable multipath from now for even /boot  which is /dev/sda1  and for lvm PV /dev/sda2 which has now mounted LV on /  and on /swap

So here is the simple solution from redhat --

# yum install device-mapper-multipath -y
Above will install multipath package but we would not have any multipath config file at
/etc/multipath.conf
Create this file now with command

# mpathconf --enable

Now we will add wwid of our /dev/sda2 device

# multipath -a /dev/sda2

wwid '3600d02300069c9ce09d41c4ac9c53200' added

Now run multipath again to check ..
# multipath
Oct 21 09:37:19 | 3600d02300069c9ce09d41c4ac9c53200: ignoring map

Now we will rebuild initrd in order to include multipath driver during kernel load.




# dracut --force -H --add multipath


Done !

you can simply reboot your server.

Comments

Post a Comment

Popular posts from this blog

Running web ssh client on port 443 /80 with nginx as reverse proxy

-
Package used         : shellinabox , nginx Repository used        : epel-release Linux distro used    : Centos 7.6 nginx reverse proxy server ip : 192.168.1.65 shellinabox web ssh server ip : 192.168.1.111 login to web ssh server first install epel-repo # yum install epel-release -y install shellinabox package # yum -y install shellinabox start and enable shellinaboxd service # systemctl enable shellinaboxd && systemctl start shellinaboxd By default shellinaboxd service starts with ssl port 4200 for us to run this in a reverse proxy environment need to make this as insecure hence the encryption will be done by nginx to end user. edit file /etc/sysconfig/shellinabox  like bellow- USER=shellinabox GROUP=shellinabox CERTDIR=/var/lib/shellinabox PORT=4200 OPTS="--disable-ssl-menu -s /:LOGIN" OPTS="-t -s /:SSH:192.168.1.111" save file exit and restart service # systemctl restart shellinaboxd Now open fire...
Read more

Running cockpit behind nginx reverse proxy with nginx ssl and cockpit non ssl

-
Domain for web access to cockpit : cockpit.mylab.local cockpit server ip : 192.168.1.61 nginx server ip   : 192.168.1.65 Linux distro using is Centos 7.6 Login to cockpit server Create a file [root@repo ~]# vim /etc/cockpit/cockpit.conf content will be like [WebService] Origins = https://cockpit.mylab.local wss://cockpit.mylab.local ProtocolHeader = X-Forwarded-Proto AllowUnencrypted = true save and restart cockpit # systemctl restart cockpit now  login to your nginx webserver and install nginx # yum install nginx -y create a new file vim /etc/nginx/conf.d/cockpit.conf paste content as bellow server {     listen         80;     listen         443 ssl http2;     server_name    cockpit.mylab.local;     ssl_certificate /etc/ssl/certs/cockpit-selfsigned.crt;     ssl_certifica...
Read more

Setup VOD streaming server with nginx using RTMP on Ubuntu 18.04

-
Install required packages for source code nginx build # apt-get install -y build-essential ca-certificates wget curl libpcre3 libpcre3-dev autoconf unzip automake libtool tar git libssl-dev zlib1g-dev uuid-dev lsb-release vim htop sysstat ufw fail2ban makepasswd libgd-dev libgeoip-dev -y create a directory # mkdir /usr/local/src/nginx/ # cd /usr/local/src/nginx/ download and extract nginx tar # wget -qO- http://nginx.org/download/nginx-1.14.2.tar.gz | tar zxf - clone nginx rtmp module # git clone https://github.com/arut/nginx-rtmp-module Download other modules - PCRE version 8.42 # wget https://ftp.pcre.org/pub/pcre/pcre-8.42.tar.gz && tar xzvf pcre-8.42.tar.gz - zlib version 1.2.11 # wget https://www.zlib.net/zlib-1.2.11.tar.gz && tar xzvf zlib-1.2.11.tar.gz - OpenSSL version 1.1.0h # wget https://www.openssl.org/source/openssl-1.1.0h.tar.gz && tar xzvf openssl-1.1.0h.tar.gz # cd nginx-1.14.2/ configure  nginx with modules and options # ./configure --add-...
Read more