Q1: What is the use of docker update command with example and image?

DevOps
Posted on | by anil

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The docker update command dynamically updates container configuration like cpu, memory etc.

To specify more than one container, provide space-separated list of container names or IDs.

		root@ip-172-31-28-155:/home/ubuntu# docker stats | egrep "CONTAINER|anoop_ubuntu_mem"
		CONTAINER ID   NAME                         CPU %     MEM USAGE / LIMIT     MEM %     NET I/O           BLOCK I/O         PIDS
		ae8459944595   anoop_ubuntu_mem             0.00%     3.781MiB / <strong><span class="has-inline-color has-primary-color">2GiB</span></strong>       0.18%     1.23kB / 0B       0B / 0B           3

		root@ip-172-31-28-155:/home/ubuntu# <strong><span class="has-inline-color has-primary-color">docker update --memory "5g" ae8459944595</span></strong>
		ae8459944595
		Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
		
		root@ip-172-31-28-155:/home/ubuntu# docker stats | egrep "CONTAINER|anoop_ubuntu_mem"
		CONTAINER ID   NAME                         CPU %     MEM USAGE / LIMIT     MEM %     NET I/O           BLOCK I/O         PIDS
		ae8459944595   anoop_ubuntu_mem             0.00%     3.781MiB /<strong> </strong><span class="has-inline-color has-primary-color"><strong>5GiB</strong>       </span>0.07%     1.23kB / 0B       0B / 0B           3Code language: HTML, XML (xml)