greengrass v1.8.1 log
[2019-08-02T03:30:28.743-04:00][WARN]-MQTT[client] dial tcp: lookup a1ijl5s1n8kf6a-ats.iot.us-east-1.amazonaws.com on 127.0.0.53:53: read udp 127.0.0.1:49567->127.0.$
[2019-08-02T03:30:28.743-04:00][WARN]-MQTT[client] Failed to connect to a broker
[2019-08-02T03:30:39.74-04:00][WARN]-MQTT[store] Trying to close memory store, but not open
[2019-08-02T03:30:39.74-04:00][WARN]-MQTT connection attempt failed and will be retried. {"attemptId": "nVwA", "clientId": "YoungsoftIoTGroup_Core", "errorStrin$
[2019-08-02T03:30:59.742-04:00][WARN]-MQTT[client] dial tcp: lookup a1ijl5s1n8kf6a-ats.iot.us-east-1.amazonaws.com on 127.0.0.53:53: read udp 127.0.0.1:49845->127.0.$
[2019-08-02T03:30:59.742-04:00][WARN]-MQTT[client] Failed to connect to a broker
[2019-08-02T03:31:10.741-04:00][WARN]-MQTT[store] Trying to close memory store, but not open
[2019-08-02T03:31:10.741-04:00][WARN]-MQTT connection attempt failed and will be retried. {"attemptId": "BAxL", "clientId": "YoungsoftIoTGroup_Core", "errorStrin$
[2019-08-02T03:31:30.742-04:00][WARN]-MQTT[client] dial tcp: lookup a1ijl5s1n8kf6a-ats.iot.us-east-1.amazonaws.com on 127.0.0.53:53: read udp 127.0.0.1:39151->127.0.$
[2019-08-02T03:31:30.742-04:00][WARN]-MQTT[client] Failed to connect to a broker
[2019-08-02T03:31:41.741-04:00][WARN]-MQTT[store] Trying to close memory store, but not open
[2019-08-02T03:31:41.741-04:00][WARN]-MQTT connection attempt failed and will be retried. {"attemptId": "mQbd", "clientId": "YoungsoftIoTGroup_Core", "errorStrin$
[2019-08-02T03:32:03.742-04:00][WARN]-MQTT[client] dial tcp: lookup a1ijl5s1n8kf6a-ats.iot.us-east-1.amazonaws.com on 127.0.0.53:53: read udp 127.0.0.1:46991->127.0.$
[2019-08-02T03:32:03.742-04:00][WARN]-MQTT[client] Failed to connect to a broker
[2019-08-02T03:32:14.741-04:00][WARN]-MQTT[store] Trying to close memory store, but not open
[2019-08-02T03:32:14.741-04:00][WARN]-MQTT connection attempt failed and will be retried. {"attemptId": "UDaF", "clientId": "YoungsoftIoTGroup_Core", "errorStrin$
[2019-08-02T03:32:41.743-04:00][WARN]-MQTT[client] dial tcp: lookup a1ijl5s1n8kf6a-ats.iot.us-east-1.amazonaws.com on 127.0.0.53:53: read udp 127.0.0.1:56790->127.0.$
My OS is Ubuntu 18.04. I used AWS IoT greengrass v1.8.1.
I followed the README.md
in each package to setup up and install step by step. All lambdas were failed to connect AWS greengrass group I created.
This is all was working and all of a sudden encountered this issue.