Shulou(Shulou.com)06/02 Report--

1 the preparation environment ensures that etcd is installed in the cluster environment and docker is installed in each node

2 install flannel2.1 flannel node IP address field assignment

Flannel relies on etcd to assign non-conflicting cluster IP. First, set the IP address field used by flannel node on etcd. The ip of etcd node in this paper is 192.168.100.20.

Etcdctl-- endpoints "http://192.168.100.20:2379" set / coreos.com/network/config'{" NetWork ":" 172.17.0.0 SubnetMin "," SubnetMax ":" 172.17.20.0 "," Backend ": {" Type ":" vxlan "}'

2.2 minion node installs flannel downloads flannel package

Wget https://github.com/coreos/flannel/releases/download/v0.9.0/flannel-v0.9.0-linux-amd64.tar.gz

Extract and copy the extracted flanneld,mk-docker-opts.sh to / usr/local/bin

Cp flanneld,mk-docker-opts.sh / usr/local/bin

2.3Create systemd service cat / lib/systemd/system/flanneld.service of flannel

[Unit]

Description=Flanneld

Documentation= https://github.com/coreos/flannel

After=network.target

Before=docker.service

[Service]

ExecStart=/usr/local/bin/flanneld-etcd-endpoints= http://192.168.100.20:2379-iface=enp0s3-ip-masq=true

Restart=on-failure

Type=notify

LimitNOFILE=65536

[Install]

WantedBy=multi-user.target

Start the flannel service

Systemctl start flanneld.service

The following steps are mainly done when the flannel service is started:

-get the configuration information of network from etcd.

-divide the subnet and register it in etcd.

-record subnet information to / run/flannel/subnet.env

Cat / run/flannel/subnet.env

FLANNEL_NETWORK=172.17.0.0/16

FLANNEL_SUBNET=172.17.2.1/24

FLANNEL_MTU=1450

FLANNEL_IPMASQ=true

3 configure docker startup parameters use the script provided by flannel to convert subnet.env into Docker startup parameters, and the created startup parameters are located in the / run/docker_opts.env file

Root@wangpei-VM:~# sh / usr/local/bin/mk-docker-opts.sh-d / run/docker_opts.env-c

Root@wangpei-VM:~# cat / run/docker_opts.env

DOCKER_OPTS= "- bip=172.17.2.1/24-ip-masq=false-mtu=1450"

Write this statement to / etc/default/docker as the environment variable started by docker

Cat / etc/default/docker | grep DOCKER_OPTS

DOCKER_OPTS= "- bip=172.17.2.1/24-ip-masq=false-mtu=1450"

Startup parameters in docker

Root@192:~# awk'! / # / {if ($0,000= ") print}'/ lib/systemd/system/docker.service

[Unit]

Description=Docker Application Container Engine

Documentation= https://docs.docker.com

After=network.target docker.socket firewalld.service flanneld.service

Requires=docker.socket

[Service]

Type=notify

EnvironmentFile=-/etc/default/docker

ExecStartPre=/usr/local/bin/mk-docker-opts.sh-d / run/docker_opts.env-c

EnvironmentFile=-/run/docker_opts.env

ExecStart=/usr/bin/dockerd-H fd:// $DOCKER_OPTS

ExecReload=/bin/kill-s HUP $MAINPID

LimitNOFILE=1048576

LimitNPROC=infinity

LimitCORE=infinity

TasksMax=infinity

TimeoutStartSec=0

Delegate=yes

KillMode=process

[Install]

WantedBy=multi-user.target

Load the configuration and start docker

Root@wangpei-VM:~# systemctl daemon-reload

Root@wangpei-VM:~# systemctl restart docker

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