Environment variables for a connection¶
The following environment variables are available in the operation post_configure_source and add_source of the script component:
SOURCE_NODE: name of the source node in the relationship (e.g.,
Bash_1).TARGET_NODE: name of the target node in the relationship (e.g.,
Bash_2).SOURCE_HOST: name of the compute node which hosts the source node (e.g.,
Compute_1).TARGET_HOST: name of the compute node which hosts the target node (e.g.,
Compute_2).SOURCE_IP and TARGET_IP: the runtime IP address of the compute nodes, which host the source and target components, respectively.
All properties of the components are also available. They are prefixed by
SOURCE_andTARGET_(e.g., SOURCE_PORT, TARGET_PORT, etc.).
Examples¶
Select
Bash_2.Set the
portproperty to27017.Add an entry in the
envproperty with keyFOOvaluebar.
Figure 1. Set environment variable on a target node¶
In post_configure_source of Bash_1, we can access the environment variables of Bash_2:
# Result: Bash_2 is running on Compute_2 on port 27017
echo "$TARGET_NODE is running on $TARGET_HOST on port $TARGET_PORT"
# Result: Bash_2 has environment variable FOO with value: bar
echo "$TARGET_NODE has environment variable FOO with value: $TARGET_FOO"