Working controller & docker container for GKE

docker/Dockerfile

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+# Dockerfile for ZeroTier Central Controllers
+FROM centos:7
+MAINTAINER Adam Ierymekno <adam.ierymenko@zerotier.com>, Grant Limberg <grant.limberg@zerotier.com>
+
+RUN yum update -y
+RUN yum install -y https://download.postgresql.org/pub/repos/yum/10/redhat/rhel-7-x86_64/pgdg-centos10-10-2.noarch.rpm
+RUN yum install -y postgresql10
+
+ADD zerotier-one /usr/local/bin/zerotier-one
+RUN chmod a+x /usr/local/bin/zerotier-one
+
+ADD docker/main.sh /
+RUN chmod a+x /main.sh
+
+ENTRYPOINT /main.sh 

docker/main.sh

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+#!/usr/bin/env bash
+
+if [ -z "$ZT_IDENTITY_PATH" ]; then
+    echo '*** FAILED: ZT_IDENTITY_PATH environment variable is not defined'
+    exit 1
+fi
+if [ -z "$ZT_DB_HOST" ]; then
+    echo '*** FAILED: ZT_DB_HOST environment variable not defined'
+    exit 1
+fi
+if [ -z "$ZT_DB_PORT" ]; then
+    echo '*** FAILED: ZT_DB_PORT environment variable not defined'
+    exit 1
+fi
+if [ -z "$ZT_DB_USER" ]; then
+    echo '*** FAILED: ZT_DB_USER environment variable not defined'
+    exit 1
+fi
+if [ -z "$ZT_DB_PASSWORD" ]; then
+    echo '*** FAILED: ZT_DB_PASSWORD environment variable not defined'
+    exit 1
+fi
+
+mkdir -p /var/lib/zerotier-one
+
+pushd /var/lib/zerotier-one
+ln -s $ZT_IDENTITY_PATH/identity.public identity.public
+ln -s $ZT_IDENTITY_PATH/identity.secret identity.secret
+popd
+
+echo "{
+    \"settings\": {
+        \"portMappingEnabled\": true,
+        \"softwareUpdate\": \"disable\",
+        \"interfadePrefixBlacklist\": [
+            \"inot\",
+            \"nat64\"
+        ],
+        \"controllerDbPath\": \"postgres:host=${ZT_DB_HOST} port=${ZT_DB_PORT} dbname=ztc user=${ZT_DB_USER} password=${ZT_DB_PASSWORD}\"
+    }
+}    
+" > /var/lib/zerotier-one/local.conf
+
+exec /usr/local/bin/zerotier-one /var/lib/zerotier-one