Hi, I have had a hadoop installation from sources. I had started the container named hadoop-c I rebooted the machine and after a couple of days I came back to same virtual machine and do
docker run -dit --name=hadoop-c hadoop-build-1001 so I get docker: Error response from daemon: Conflict. The container name "/hadoop-c" is already in use by container "174509213b303b984e6f09cce99487301f1ffb177ddb08091b6e94ca7e10e20b". You have to remove (or rename) that container to be able to reuse that name. See 'docker run --help'. I wanted to do know that after a shutdown does the container still remains active on next boot always or this is the expected thing. I am not very familiar with hadoop and dockers etc. What should I do?. Also I have one more question I installed Hadoop on a Ubuntu 19.10 virtual machine. I downloaded the source file that means among the releases available on this page https://hadoop.apache.org/releases.html I downloaded 3.1.3 file https://www.apache.org/dyn/closer.cgi/hadoop/common/hadoop-3.1.3/hadoop-3.1.3-src.tar.gz the installation was successful. I got the following message It appears that I have low memory. image https://i.stack.imgur.com/Qwke9.jpg I have allotted 2 GB of memory for this virtual machine of Ubuntu. If you can see in the screenshot there are many more virtual machines which I intend to use. https://i.stack.imgur.com/7yi3M.jpg I need other virtual machines for various development works. I want to know how should or rather in what range I should increase the memory so that I can work with Hadoop ecosystem on ubuntu 19.10. I plan to do some development work which can be done with single nodes later on I want to work with multiple nodes. I am doing all this on my laptop which has 12 GB RAM. and I have following virtual machines 1)Ubuntu 19.10 VM 2)Debian 10 VM 4)Cloudera Hadoop VM 5)Ubuntu 19.10 (I have installed Hadoop in this VM) I have given 2 GB to all VMs. I also want to know as seen in above I get a Hadoop command prompt. How can I again get it I mean if I power off the machine. I notice the shell in above images as debian@4d943db32085:~/hadoop$ debian is my username configured in Ubuntu 19.10 I want to know what is this kind of shell that I got above and why is this number debian@4d943db32085 coming What could be a problem due to which I am getting a low memory message? What should I check? -------------------------