how to set variable in API

[#1]

how to use API with variable inside the API

example , we replace the INSTALLED with ACTION=INSTALLED

and then we run the follwing

curl -u $USER:$PASSWD -i -H 'X-Requested-By: ambari' -X PUT -d '{"RequestInfo": {"context" :"Stop AMBARI_METRICS via REST"}, "Body": {"ServiceIfo": {"state": "$ACTION"}}}' http://$HOST:8080/api/v1/clusters/$CLUSTER_NAME/services/AMBARI_METRICS

but the API not accepted the variable - $ACTION

please advice how to set the variable ACTION in the API so API will read this variable

example of API output when using the variable

HTTP/1.1 400 Bad Request
X-Frame-Options: DENY
X-XSS-Protection: 1; mode=block
X-Content-Type-Options: nosniff
Cache-Control: no-store
Pragma: no-cache
Set-Cookie: AMBARISESSIONID=1t1s2senrg3mtqgzda2qp8yv6;Path=/;HttpOnly
Expires: Thu, 01 Jan 1970 00:00:00 GMT
User: admin
Content-Type: text/plain
Content-Length: 313 

[#2 · Accepted solution]

@Michael Bronson

One solution can be as following:

# export HOST=amb25101.example.com
# export USER=admin
# export PASSWD=admin
# export ACTION=INSTALLED
# export CLUSTER_NAME=plain_ambari

# echo {"\"RequestInfo\": {\"context\" :\"Stop AMBARI_METRICS via REST\"}, \"Body\": {\"ServiceInfo\": {\"state\": \"$ACTION\"}}}" > /tmp/postData.txt
# curl -u $USER:$PASSWD -i -H 'X-Requested-By: ambari' -X PUT -d@/tmp/postData.txt http://$HOST:8080/api/v1/clusters/$CLUSTER_NAME/services/AMBARI_METRICS

.

So basically we are doing the following thing differently:

# echo {"\"RequestInfo\": {\"context\" :\"Stop AMBARI_METRICS via REST\"}, \"Body\": {\"ServiceInfo\": {\"state\": \"$ACTION\"}}}" > /tmp/postData.txt

# curl -u $USER:$PASSWD -i -H 'X-Requested-By: ambari' -X PUT -d@/tmp/postData.txt http://$HOST:8080/api/v1/clusters/$CLUSTER_NAME/services/AMBARI_METRICS

.