For further documentation see https://istio.io website

{{-
  $deps := dict
    "global.outboundTrafficPolicy" "meshConfig.outboundTrafficPolicy"
    "global.certificates" "meshConfig.certificates"
    "global.localityLbSetting" "meshConfig.localityLbSetting"
    "global.policyCheckFailOpen" "meshConfig.policyCheckFailOpen"
    "global.enableTracing" "meshConfig.enableTracing"

Istio 1.0 includes the gateways in istio-system. Since the external IP is associated
with the Service and bound to the namespace, it is recommended to:

1. Install the new gateway in a new namespace.
2. Copy any TLS certificate to the new namespace, and configure the domains.
3. Checking the new gateway work - for example by overriding the IP in /etc/hosts
4. Modify the DNS server to add the A record of the new namespace
5. Check traffic

Istio 1.0 includes the gateways in istio-system. Since the external IP is associated
with the Service and bound to the namespace, it is recommended to:

1. Install the new gateway in a new namespace.
2. Copy any TLS certificate to the new namespace, and configure the domains.
3. Checking the new gateway work - for example by overriding the IP in /etc/hosts
4. Modify the DNS server to add the A record of the new namespace
5. Check traffic