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openshift 4 kvm+ovs install

openshift4在日常的安装场景中，有这样一个情况，就是需要在多台配置小一些的主机上，实现跨主机的集群安装，这就需要多个kvm跨主机通讯，本来使用bridge方式，搭配可直连的ip地址，是可以满足的，但是由于ip地址管理的限制，我们没有可以直连的ip地址，那么我们就需要ovs+vxlan的方式，来解决这个问题。

本文针对2台主机，讲述如何配置ovs，以及如何启动kvm。

参考资料：

mtu 调整：

vxlan

nat

基于本文的ocp4安装实践，见笔记： https://github.com/wangzheng422/docker_env/blob/master/redhat/prepare/cmri/lab.md

on redhat-01

yum -y install openvswitch2.11 NetworkManager-ovs
# install pkg for vnc and kvm

systemctl enable --now openvswitch
systemctl status openvswitch

systemctl enable --now libvirtd

cat << 'EOF' > /etc/sysconfig/network-scripts/ifcfg-br-int 
DEVICE=br-int
ONBOOT=yes
DEVICETYPE=ovs
TYPE=OVSBridge
BOOTPROTO=static
HOTPLUG=no
IPADDR=192.168.7.1
PREFIX=24
MTU=1450
EOF

cat << 'EOF' > /etc/sysconfig/network-scripts/ifcfg-vxlan1
DEVICE=vxlan1
ONBOOT=yes
DEVICETYPE=ovs
TYPE=OVSTunnel
OVS_BRIDGE=br-int
OVS_TUNNEL_TYPE=vxlan
OVS_TUNNEL_OPTIONS="options:remote_ip=172.29.159.100"
BOOTPROTO=static
HOTPLUG=no
EOF

systemctl restart network

ovs-vsctl show

# ovs-vsctl set int br-int mtu_request=1450
# ovs-vsctl set int br-int mtu_request=[]

mkdir -p /data/kvm
cd /data/kvm

# bridge mode
cat << 'EOF' > ovsnet.xml
<network>
  <name>br-int</name>
  <forward mode='bridge'/>
  <bridge name='br-int'/>
  <virtualport type='openvswitch'/>
</network>
EOF

virsh net-define ovsnet.xml
virsh net-start br-int
virsh net-autostart br-int

# restore
virsh net-destroy br-int
virsh net-undefine br-int
/bin/rm -f /etc/sysconfig/network-scripts/ifcfg-br-int 
/bin/rm -f /etc/sysconfig/network-scripts/ifcfg-vxlan1
systemctl restart network

on redhat-02

 
yum -y install openvswitch2.11 NetworkManager-ovs
# install pkg for vnc and kvm

systemctl enable --now openvswitch
systemctl status openvswitch

systemctl enable --now libvirtd

ovs-vsctl show

cat << 'EOF' > /etc/sysconfig/network-scripts/ifcfg-br-int 
DEVICE=br-int
ONBOOT=yes
DEVICETYPE=ovs
TYPE=OVSBridge
BOOTPROTO=static
HOTPLUG=no
IPADDR=192.168.7.2
PREFIX=24
MTU=1450
EOF

cat << 'EOF' > /etc/sysconfig/network-scripts/ifcfg-vxlan1
DEVICE=vxlan1
ONBOOT=yes
DEVICETYPE=ovs
TYPE=OVSTunnel
OVS_BRIDGE=br-int
OVS_TUNNEL_TYPE=vxlan
OVS_TUNNEL_OPTIONS="options:remote_ip=172.29.159.99"
BOOTPROTO=static
HOTPLUG=no
EOF

systemctl restart network

ovs-vsctl show

# ovs-vsctl set int br-int mtu_request=1450

mkdir -p /data/kvm
cd /data/kvm

# bridge mode
cat << 'EOF' > ovsnet.xml
<network>
  <name>br-int</name>
  <forward mode='bridge'/>
  <bridge name='br-int'/>
  <virtualport type='openvswitch'/>
</network>
EOF

virsh net-define ovsnet.xml
virsh net-start br-int
virsh net-autostart br-int

# restore
virsh net-destroy br-int
virsh net-undefine br-int

创建虚拟机

虚机创建，注意调整每个虚机的mtu，关键在虚拟机里面，操作系统对网卡mtu的设置，这个其实是kernel安装的时候，启动参数的问题，请参考这里： https://www.man7.org/linux/man-pages/man7/dracut.cmdline.7.html

mkdir -p /data/kvm
cd /data/kvm

lvremove -f datavg/helperlv
lvcreate -y -L 230G -n helperlv datavg

# 230G
virt-install --name="ocp4-aHelper" --vcpus=2 --ram=4096 \
--disk path=/dev/datavg/helperlv,device=disk,bus=virtio,format=raw \
--os-variant centos7.0 --network network:br-int,model=virtio \
--boot menu=on --location /data/kvm/rhel-server-7.8-x86_64-dvd.iso \
--initrd-inject /data/kvm/helper-ks.cfg --extra-args "inst.ks=file:/helper-ks.cfg"

弯路

ovs上的虚拟机，要开启mtu调整

sysctl -w net.ipv4.tcp_mtu_probing=1

cat << 'EOF' > /etc/sysctl.d/99-sysctl-wzh.conf
net.ipv4.tcp_mtu_probing = 1
EOF

sysctl --system

ovs-vsctl add-port br-int vxlan1 -- \
  set Interface vxlan1 type=vxlan options:remote_ip=172.29.159.99

ovs-vsctl set int br-int mtu_request=1450

nmcli connection add type vxlan id 100 remote 172.29.159.99 ipv4.addresses 192.168.77.2/24 ipv4.method manual ifname vxlan1 connection.id vxlan1 vxlan.parent enp2s0f0 
nmcli conn up vxlan1

nmcli conn del vxlan1

ovs-vsctl add-port br-int vxlan1 -- \
  set Interface vxlan1 type=vxlan options:remote_ip=172.29.159.100

ovs-vsctl set int br-int mtu_request=1450
ovs-vsctl set int br-int mtu_request=[]

systemctl restart network

# restore
ovs-vsctl del-port br-int vxlan1
ovs-vsctl del-br br-int
rm -f /etc/sysconfig/network-scripts/ifcfg-br-int 
systemctl restart network

man nm-openvswitch

nmcli con add type ovs-bridge \
    con-name br-private \
    ifname br-private \
    ipv4.method 'manual' \
    ipv4.address '192.168.7.1/24' 

nmcli connection modify br-private ipv4.addresses 192.168.7.1/24
nmcli connection modify eno2 ipv4.gateway 192.168.39.254
nmcli connection modify eno2 ipv4.dns 192.168.39.129
nmcli connection modify br-private ipv4.method manual
nmcli connection modify br-private connection.autoconnect yes
nmcli connection modify br-private connection.autoconnect yes
nmcli connection reload

nmcli con del br-private

nmcli connection add type vxlan id 100 remote 172.29.159.100 ipv4.addresses 192.168.77.1/24 ipv4.method manual ifname vxlan1 connection.id vxlan1 vxlan.parent enp2s0f0 
nmcli conn up vxlan1

nmcli conn del vxlan1

nmcli conn add type ovs-bridge conn.interface bridge0
nmcli conn add type ovs-port conn.interface port0 master bridge0
nmcli conn add type ovs-interface conn.interface iface0 master port0 \
             ipv4.method manual ipv4.address 192.168.7.1/24

nmcli conn del ovs-slave-iface0
nmcli conn del ovs-slave-port0
nmcli conn del ovs-bridge-bridge0

ovs-vsctl add-br br-private

ovs-dpctl show
ovs-ofctl show br0