Containers managed by ASAB Maestro

Hostname and container name

The hostname and the container_name is set to INSTANCE_ID (ie mongo-1).

/etc/hosts

/etc/hosts is provided by the ASAB Maestro with the names and IP addresses of all instances in the cluster. This is used for service discovery purposes.

Example of the /etc/hosts:

# This file is generated by ASAB Remote Control
# WARNING: DON'T MODIFY IT MANUALLY !!!

127.0.0.1   localhost
::1 localhost ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters

# Nodes
192.168.64.1    node1
192.168.64.2    node2

# Instances
192.168.64.1    zoonavigator-1
192.168.64.1    nginx-1
192.168.64.1    mongo-1
192.168.64.1    seacat-auth-1
192.168.64.2    zookeeper-1
192.168.64.2    asab-governator-1
192.168.64.2    asab-library-1
192.168.64.2    asab-config-1

Note

The hosts file is located at /opt/site/hosts and mounted into containers.

Environment variables

Following environment variables are made available to each instance:

• NODE_ID
• SERVICE_ID
• INSTANCE_ID

Note

Other environment variables can be provided by technologies.