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6.x Setup

Set static ip

vim /etc/sysconfig/network-scripts/ifcfg-eth0

DEVICE=eth0
HWADDR=08:00:27:90:69:AB
TYPE=Ethernet 
ONBOOT=yes
NM_CONTROLLED=no
BOOTPROTO=static
IPADDR=192.168.56.100
NETMASK=255.255.255.0
DNS1=8.8.8.8
DNS2=8.8.4.4
GATEWAY=$GW
IPV6INIT=no  

### DNS
vim /etc/resolv.conf

nameserver 4.2.2.2

### Change NIC name
vim /etc/udev/rules.d/70-persistent-net.rules
### Change hostname 
vim /etc/networks
### NFS
#### master
start relevant services

/etc/init.d/rpcbind start /etc/init.d/nfs start /etc/init.d/nfslock start chkconfig rpcbind on chkconfig --level 2345 nfs on chkconfig nfslock on chkconfig --list | grep nfs

vim /etc/exports

/home 192.168.56.0/24(rw,no_root_squash,async)

mount

exportfs -arv

#### slave
start relevant services: rpcbind nfslock<br>
vim /etc/fstab

master:/home /home nfs

### YUM Repo
List current status

yum repolist all

Disable repos

yum-config-manager --disable base extras updates

Enable repos

yum-config-manager --enable c6-media

Install compiler

yum install gcc gcc-c++ gcc-gfortran

### Source Network Address Translation (sNAT)
Goal: Slave node with only one network interface (eth0: 192.168.0.101) wants to access the internet via master node who has two network interfaces, internal (eth0: 192.168.0.100) and external (eth1: 217.33.156.23).
* Commands on master node

echo "1" > /proc/sys/net/ipv4/ip_forward iptables -A INPUT -i eth0 -j ACCEPT iptables -t nat -A POSTROUTING -s 192.168.0.0/24 -o eth1 -j MASQUERADE

* Commands on slave node

route add default gw 192.168.0.100

Credit to vbird @ http://linux.vbird.org/linux_server/0250simple_firewall.php 
### Install InfiniBand Network
Understand InfiniBand [doc](https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/networking_guide/ch-Configure_InfiniBand_and_RDMA_Networks)
Get info on hardware (<b>Mellanox</b> NIC)

lspci | grep Mellanox

01:00.0 Network controller: Mellanox Technologies MT27500 Family [ConnectX-3]

#### Driver
[Get it](https://www.mellanox.com/products/ethernet-drivers/linux/mlnx_en) / [Installtion Guide](https://docs.mellanox.com/display/MLNXEN501000/Installing+MLNX_EN)
#### Subnet Manager 
[OpenSM](https://docs.oracle.com/cd/E18476_01/doc.220/e18478/GUID-9FF8B5B0-3481-4B73-89D3-108CBD7EB989.htm#ELMOG76340)

https://docs.mellanox.com/pages/viewpage.action?pageId=12004991

## 8.0 
Install Extra Packages for Enterprise Linux

dnf install epel-release -y

Install screen

dnf install screen


* Repo
```shell
cat << EOF > CentOS-Base.repo 
[base]
name=CentOS-\$releasever - Base - 163.com
baseurl=http://mirrors.163.com/centos-vault/centos/\$releasever/os/\$basearch/
gpgcheck=1
gpgkey=http://mirrors.163.com/centos-vault/centos/7/os/x86_64/RPM-GPG-KEY-CentOS-7

[updates]
name=CentOS-\$releasever - Updates - 163.com
baseurl=http://mirrors.163.com/centos-vault/centos/\$releasever/updates/\$basearch/
gpgcheck=1
gpgkey=http://mirrors.163.com/centos-vault/centos/7/os/x86_64/RPM-GPG-KEY-CentOS-7

[extras]
name=CentOS-\$releasever - Extras - 163.com
baseurl=http://mirrors.163.com/centos-vault/centos/\$releasever/extras/\$basearch/
gpgcheck=1
gpgkey=http://mirrors.163.com/centos-vault/centos/7/os/x86_64/RPM-GPG-KEY-CentOS-7

[centosplus]
name=CentOS-\$releasever - Plus - 163.com
baseurl=http://mirrors.163.com/centos-vault/centos/\$releasever/centosplus/\$basearch/
gpgcheck=1
enabled=0
gpgkey=http://mirrors.163.com/centos-vault/centos/7/os/x86_64/RPM-GPG-KEY-CentOS-7
EOF
scp CentOS-Base.repo root@$IP:/etc/yum.repos.d/CentOS-Base.repo
  • NFS
 
for IP in `cat /var/lib/misc/dnsmasq.leases | cut -d ' ' -f 3`; 
do  
    dist=`ssh root@$IP lsb_release -is 2> /dev/null` 
    if [ "$dist" != "Ubuntu" ] ;
    then 
        echo $IP $dist
        ssh root@$IP pkill yum
        echo "nameserver 222.88.88.88" | ssh root@$IP tee /etc/resolv.conf
        ssh root@$IP yum clean all
        ssh root@$IP cat /etc/yum.repos.d/CentOS-Base.repo
        ssh root@$IP yum makecache
        ssh root@$IP yum install -y nfs-utils ;
    fi
done



* Repair the delay bug
```shell
apt install -y sshpass
echo "UseDNS no" | sshpass -p $ROOT_PASSWD ssh -o "StrictHostKeyChecking no" root@$IP tee -a /etc/ssh/sshd_config; 
sshpass -p $ROOT_PASSWD ssh -o "StrictHostKeyChecking no" root@$IP systemctl restart sshd