configure_kubernetes_centos.sh

#!/bin/bash

set -x

master_ip=$1
ipaddr=$(ip addr show dev eth0 | grep "inet " | cut -d ' ' -f 6  | cut -f 1 -d '/')
is_master=${2:-"true"}

[ -n "$master_ip" ] || exit 1

echo "Master IP is $master_ip"
echo "My IP is $ipaddr"

configure_etcd() {
    sed  -i "s/ETCD_LISTEN_CLIENT_URLS=.*$/ETCD_LISTEN_CLIENT_URLS=\"http:\/\/localhost:2379,http:\/\/$master_ip:2379\"/" /etc/etcd/etcd.conf
    systemctl restart etcd
    etcdctl mk /coreos.com/network/config '{"Network":"172.17.0.0/16"}'

}

configure_kube_master() {
    #bug in CentOS
    mkdir -p /var/run/kubernetes
    chown kube.kube /var/run/kubernetes
    sed  -i "s/KUBE_MASTER=.*$/KUBE_MASTER=\"--master=$master_ip:8080\"/" /etc/kubernetes/apiserver
    sed  -i "s/KUBE_SERVICE_ADDRESSES=.*$/KUBE_SERVICE_ADDRESSES=\"--service-cluster-ip-range=172.17.0.0\/16\"/" /etc/kubernetes/apiserver
    sed  -i "s/KUBE_API_ADDRESS=.*$/KUBE_API_ADDRESS=\"--insecure-bind-address=0.0.0.0\"/" /etc/kubernetes/apiserver
}

configure_flanneld() {
   sed -i "s/FLANNEL_ETCD=.*$/FLANNEL_ETCD=\"http:\/\/$master_ip:2379\"/" /etc/sysconfig/flanneld
   sed -i "s/FLANNEL_ETCD_KEY=.*$/FLANNEL_ETCD_KEY=\"\/coreos.com\/network\"/" /etc/sysconfig/flanneld

}

configure_kube_node() {
    cat << EOF > /etc/kubernetes/kubelet
KUBELET_ADDRESS="--address=0.0.0.0"
KUBELET_PORT="--port=10250"
KUBELET_HOSTNAME="--hostname_override=$ipaddr"
KUBELET_API_SERVER="--api_servers=http://$master_ip:8080"
KUBELET_ARGS=""
EOF

    cat << EOF > /etc/kubernetes/config
KUBE_LOGTOSTDERR="--logtostderr=true"
KUBE_LOG_LEVEL="--v=0"
KUBE_ALLOW_PRIV="--allow-privileged=false"
KUBE_MASTER="--master=http://$master_ip:8080"
EOF
}

start_services() {
   
    systemctl enable flannel
    systemctl restart flanneld
    #systemctl status $SERVICES 
   
    systemctl enable docker
    systemctl restart flanneld
    if [[ $? -ne 0 ]]
    then
      #work around for some bug in docker 1.62
      rm -rf /var/lib/docker/
      systemctl restart docker
    fi
    let status=$?
    systemctl enable kube-proxy
    systemctl restart kube-proxy
    let status=status+$?
    
    systemctl enable kubelet
    systemctl restart kubelet
    let status=status+$?
    
    for SERVICES in flanneld docker kube-proxy kubelet; do
       systemctl status $SERVICES
    done
    return $status
}


configure_etcd
echo "Configured etcd"
configure_kube_master
echo "Configured kube master"
configure_flanneld
echo "Configured flanneld"
configure_kube_node
echo "Configured kube node"
start_services
exit $?