consul_bootstrap_centos.sh

#!/bin/bash

function packagereqchecker {
    declare -a packages=("wget" "setroubleshoot-server" "selinux-policy-devel" "unzip")

    for app in "${packages[@]}";
    do
        echo $app
        if yum list installed $app 2>&1 > /dev/null;
        then
            echo "$app is already installed"
        else
            yum install $app -y > /dev/null
        fi      
    done
}


function consul_user {
if id "consul" > /dev/null 2>&1; then
    echo "consul user already exists"
else 
    sudo useradd --system --home /etc/consul.d --shell /bin/false consul
fi

if [ ! -d /opt/consul ]; then
    sudo mkdir -p /opt/consul
    sudo chown -R consul:consul /opt/consul
    sudo chmod -R 777 /opt/consul
fi
}

function consul_installer {
    if consul;
    then
        echo "consul is already installed"
    else
        CONSUL_VERSION="1.6.0"
        wget -O consul.zip https://releases.hashicorp.com/consul/${CONSUL_VERSION}/consul_${CONSUL_VERSION}_linux_amd64.zip
        unzip consul.zip
        chown root:root consul
        mv consul /usr/local/bin/
        consul -autocomplete-install
        complete -C /usr/local/bin/consul consul
    fi
}

function consul_config {
    if [ -f /etc/consul.d/tls/ ];
    then
        echo "config directory already exists"
    else
        sudo mkdir -p /etc/consul.d/tls
        sudo chown -R consul:consul /etc/consul.d
        sudo touch /etc/consul.d/consul.hcl
        sudo chmod -R 644 /etc/consul.d/tls
    fi
}

function systemd_config {
    if [ -f /etc/systemd/system/consul.service ];
    then
        echo "consul service is already cofigured"
    else
        touch /etc/systemd/system/consul.service
        cat > /etc/systemd/system/consul.service <<EOF
[Unit]
Description="HashiCorp Consul - A service mesh solution"
Documentation=https://www.consul.io/
Requires=network-online.target
After=network-online.target
ConditionFileNotEmpty=/etc/consul.d/consul.hcl

[Service]
User=consul
Group=consul
ExecStart=/usr/local/bin/consul agent -config-dir=/etc/consul.d/
ExecReload=/usr/local/bin/consul reload
KillMode=process
Restart=on-failure
LimitNOFILE=65536

[Install]
WantedBy=multi-user.target

EOF
    systemctl daemon-reload
    fi
}



packagereqchecker
consul_installer
consul_config
consul_user
systemd_config