自动安装consul，并创建对应的service并运行consul服务

auto-install-consul-start-service.sh

echo '
#! /bin/bash

####### yum update is optional #####
#yum -y update
sudo yum install firewalld -y
sudo systemctl start firewalld
sudo firewall-cmd  --add-port=8300/tcp --add-port=8301/tcp --add-port=8302/tcp --add-port=8400/tcp --add-port=8500/tcp --add-port=80/tcp --add-port=443/tcp --permanent
sudo firewall-cmd  --reload
sudo yum -y install unzip wget

### Download Consul to Host ####
mkdir /tmp/bin
cd /tmp/bin
wget https://releases.hashicorp.com/consul/1.14.2/consul_1.14.2_linux_amd64.zip
unzip consul_1.14.2_linux_amd64.zip
rm *.zip


####  Create needed folders ####
sudo mkdir /var/consul
sudo mkdir -p /home/consul/www
sudo mkdir -p /etc/consul.d/{server,bootstrap}
sudo mv consul /usr/local/bin/

###### Optional !! if you have config then comment below section ###
sudo touch /etc/consul.d/server/config.json


sudo cat <<EOF > /etc/consul.d/server/config.json
{
    "bind_addr": "0.0.0.0",
    "bootstrap_expect": 1,
    "server": true,
    "data_dir": "/var/consul",
    "dns_config": {
        "allow_stale": true,
        "max_stale": "0s"
    },
    "retry_join": [],
    "retry_interval": "10s",
    "retry_max": 100,
    "skip_leave_on_interrupt": true,
    "leave_on_terminate": false,
    "rejoin_after_leave": true,
    "addresses": {
        "http": "0.0.0.0",
        "dns": "0.0.0.0"
    }
}
EOF


#### Adding systemd service script ####


sudo cat <<EOF > /etc/systemd/system/consul.service
[Unit]
Description=consul agent
Requires=network-online.target
After=network-online.target

[Service]
EnvironmentFile=-/etc/sysconfig/consul
Environment=GOMAXPROCS=2
Restart=on-failure
ExecStart=/usr/local/bin/consul agent -config-dir=/etc/consul.d/server -rejoin -ui -data-dir=/var/consul
ExecReload=/bin/kill -HUP $MAINPID
KillSignal=SIGTERM

[Install]
WantedBy=multi-user.target
EOF

sudo systemctl daemon-reload
sudo systemctl start consul
sudo systemctl enable consul


### Consul service will not run due config above . please fill it up with your enviromental variables and restart consul service ####

' >> ./consul-install.sh
chmod +x ./consul-install.sh
sh ./consul-install.sh