shell脚本 实现生成etcd证书

配置文件

[req]
req_extensions = v3_req
distinguished_name = req_distinguished_name

[req_distinguished_name]

[ v3_req ]
basicConstraints = CA:FALSE
keyUsage = nonRepudiation, digitalSignature, keyEncipherment
subjectAltName = @alt_names

[ ssl_client ]
extendedKeyUsage = clientAuth, serverAuth
basicConstraints = CA:FALSE
subjectKeyIdentifier=hash
authorityKeyIdentifier=keyid,issuer
subjectAltName = @alt_names

[ v3_ca ]
basicConstraints = CA:TRUE
keyUsage = nonRepudiation, digitalSignature, keyEncipherment
subjectAltName = @alt_names
authorityKeyIdentifier=keyid:always,issuer

[alt_names]
DNS.1 = localhost
DNS.2 = k8s-master01
DNS.3 = k8s-master02
DNS.4 = k8s-master03
DNS.5 = lb-apiserver.kubernetes.local
DNS.6 = etcd.kube-system.svc.cluster.local
DNS.7 = etcd.kube-system.svc
DNS.8 = etcd.kube-system
DNS.9 = etcd
IP.1 = x.x.x.x
IP.2 = x.x.x.x
IP.3 = x.x.x.x
IP.4 = 127.0.0.1

调用变量文件

cat  ./node

MASTERS="k8s-master01 k8s-master02 k8s-master03"
HOSTS="k8s-master01 k8s-master02 k8s-master03"

 

 

脚本主体 main 

cat make-ssl-etcd.sh

#!/bin/bash

set -o errexit
set -o pipefail
usage()
{
    cat << EOF
Create self signed certificates

Usage : $(basename $0) -f <config> [-d <ssldir>]
      -h | --help         : Show this message
      -f | --config       : Openssl configuration file
      -d | --ssldir       : Directory where the certificates will be installed

               ex :
               $(basename $0) -f openssl.conf -d /srv/ssl
EOF
}
# Options parsing
while (($#)); do
    case "$1" in
        -h | --help)   usage;   exit 0;;
        -f | --config) CONFIG=${2}; shift 2;;
        -d | --ssldir) SSLDIR="${2}"; shift 2;;
        *)
            usage
            echo "ERROR : Unknown option"
            exit 3
        ;;
    esac
done

if [ -z ${CONFIG} ]; then
    echo "ERROR: the openssl configuration file is missing. option -f"
    exit 1
fi
if [ -z ${SSLDIR} ]; then
    SSLDIR="/etc/ssl/etcd"
fi
source ./node
tmpdir=$(mktemp -d /tmp/etcd_cacert.XXXXXX)
trap 'rm -rf "${tmpdir}"' EXIT
cd "${tmpdir}"

mkdir -p "${SSLDIR}"

# Root CA
if [ -e "$SSLDIR/ca-key.pem" ]; then
    # Reuse existing CA
    cp $SSLDIR/{ca.pem,ca-key.pem} .
else
    openssl genrsa -out ca-key.pem 2048 > /dev/null 2>&1
    openssl req -x509 -new -nodes -key ca-key.pem -days 36500 -out ca.pem -subj "/CN=etcd-ca" > /dev/null 2>&1
fi

# ETCD member
if [ -n "$MASTERS" ]; then
    for host in $MASTERS; do
        cn="${host%%.*}"
        # Member key
        openssl genrsa -out member-${host}-key.pem 2048 > /dev/null 2>&1
        openssl req -new -key member-${host}-key.pem -out member-${host}.csr -subj "/CN=etcd-member-${cn}" -config ${CONFIG} > /dev/null 2>&1
        openssl x509 -req -in member-${host}.csr -CA ca.pem -CAkey ca-key.pem -CAcreateserial -out member-${host}.pem -days 36500 -extensions ssl_client -extfile ${CONFIG} > /dev/null 2>&1

        # Admin key
        openssl genrsa -out admin-${host}-key.pem 2048 > /dev/null 2>&1
        openssl req -new -key admin-${host}-key.pem -out admin-${host}.csr -subj "/CN=etcd-admin-${cn}" > /dev/null 2>&1
        openssl x509 -req -in admin-${host}.csr -CA ca.pem -CAkey ca-key.pem -CAcreateserial -out admin-${host}.pem -days 36500 -extensions ssl_client  -extfile ${CONFIG} > /dev/null 2>&1
    done
fi
echo 2
# Node keys
if [ -n "$HOSTS" ]; then
    for host in $HOSTS; do
        cn="${host%%.*}"
        openssl genrsa -out node-${host}-key.pem 2048 > /dev/null 2>&1
        openssl req -new -key node-${host}-key.pem -out node-${host}.csr -subj "/CN=etcd-node-${cn}" > /dev/null 2>&1
        openssl x509 -req -in node-${host}.csr -CA ca.pem -CAkey ca-key.pem -CAcreateserial -out node-${host}.pem -days 36500 -extensions ssl_client  -extfile ${CONFIG} > /dev/null 2>&1
    done
fi
echo 3
# Install certs
if [ -e "$SSLDIR/ca-key.pem" ]; then
    # No pass existing CA
    rm -f ca.pem ca-key.pem
fi

mv *.pem ${SSLDIR}/

 

脚本执行需要指定绝对路径

 

chmod  +x make-ssl-etcd.sh 
./make-ssl-etcd.sh     -f   $PWD/openssl.conf  -d   $PWD/pem