{"id":9300,"date":"2016-11-15T16:20:21","date_gmt":"2016-11-15T15:20:21","guid":{"rendered":"https:\/\/www.dbi-services.com\/blog\/managing-my-amazon-web-services-redhat-instance\/"},"modified":"2023-06-08T15:22:43","modified_gmt":"2023-06-08T13:22:43","slug":"managing-my-amazon-web-services-redhat-instance","status":"publish","type":"post","link":"https:\/\/www.dbi-services.com\/blog\/managing-my-amazon-web-services-redhat-instance\/","title":{"rendered":"Managing My Amazon Web Services Redhat Instance"},"content":{"rendered":"

By Mouhamadou Diaw<\/strong><\/p>\n

In a precedent Blog<\/a> I talked about how to create an AWS linux instance. Some questions can be: How to create a new user and to connect with, how to transfert files from my workstation, how to connect to my oracle instance from my workstation and so on.
\nIn this blog I am going to deal with some basic but useful \u00a0administration tasks.
\nChanging my hostname<\/span><\/strong>
\nOne thing we will probably do is to change the hostname. Indeed the linux is built with a generic hostname. Changing hostname include following tasks
\nUpdate \/etc\/hostname with the new hostname<\/p>\n

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[root@ip-172-31-47-219 etc]<\/code># vi hostname<\/code><\/div>\n
[root@ip-172-31-47-219 etc]<\/code># cat \/etc\/hostname<\/code><\/div>\n
primaserver.us-west-2.compute.internal<\/code><\/div>\n
[root@ip-172-31-47-219 etc]<\/code>#<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

Update \/etc\/hosts
\n<\/span><\/p>\n

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[root@primaserver ORCL]<\/code># cat \/etc\/hosts<\/code><\/div>\n
127.0.0.1 primaserver.us-west-2.compute.internal\u00a0 localhost localhost.localdomain localhost4 localhost4.localdomain4<\/code><\/div>\n
::1\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 localhost localhost.localdomain localhost6 localhost6.localdomain6<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

Update our <\/span>\/etc\/sysconfig\/network\u00a0with the HOSTNAME value<\/span><\/span><\/p>\n

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[root@ip-172-31-47-219 sysconfig]<\/code># cat network<\/code><\/div>\n
NETWORKING=<\/code>yes<\/code><\/div>\n
NOZEROCONF=<\/code>yes<\/code><\/div>\n
HOSTNAME=primaserver.us-west-2.compute.internal<\/code><\/div>\n
[root@ip-172-31-47-219 sysconfig]<\/code>#<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

To\u00a0keep the change permanent we have to add in <\/span>\/etc\/cloud\/cloud.cfg file the line<\/span> preserve_hostname: true
\n<\/span><\/p>\n

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[root@ip-172-31-47-219 cloud]<\/code># grep\u00a0\u00a0 preserve_hostname cloud.cfg<\/code><\/div>\n
preserve_hostname: <\/code>true<\/code><\/div>\n
[root@ip-172-31-47-219 cloud]<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

\u00a0The last step is to reboot the server<\/p>\n

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[root@ip-172-31-47-219 cloud]<\/code># reboot<\/code><\/div>\n
Using username <\/code>\"ec2-user\"<\/code>.<\/code><\/div>\n
Authenticating with public key <\/code>\"imported-openssh-key\"<\/code><\/div>\n
Last login: Mon Nov 14 03:20:13 2016 from 21.224.200.213.static.wline.lns.sme.cust.swisscom.ch<\/code><\/div>\n
[ec2-user@primaserver ~]$ <\/code>hostname<\/code><\/div>\n
primaserver.us-west-2.compute.internal<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

Creating a new user and connecting with
\n<\/span><\/strong>User creation is done by useradd as usual. But to be able to connect with this user we have to do some tasks. Suppose the new user is oracle.
\nWith oracle we have to create a .ssh directory and adjust permissions on it<\/p>\n

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[root@ip-172-31-33-57 ~]<\/code># su - oracle<\/code><\/div>\n
[oracle@ip-172-31-33-57 ~]$ <\/code>pwd<\/code><\/div>\n
\/home\/oracle<\/code><\/div>\n
[oracle@ip-172-31-33-57 ~]$ <\/code>mkdir<\/code> .<\/code>ssh<\/code><\/div>\n
\u00a0<\/code>[oracle@ip-172-31-33-57 .<\/code>ssh<\/code>]$ <\/code>chmod<\/code> 700 .<\/code>ssh<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

And then let\u2019s create an authorized_keys file<\/p>\n

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[oracle@ip-172-31-33-57 ~]$ <\/code>touch<\/code> .<\/code>ssh<\/code>\/authorized_keys<\/code><\/div>\n
[oracle@ip-172-31-33-57 ~]$ <\/code>cd<\/code> .<\/code>ssh<\/code>\/<\/code><\/div>\n
[oracle@ip-172-31-33-57 .<\/code>ssh<\/code>]$ <\/code>vi<\/code> authorized_keys<\/code><\/div>\n
[oracle@ip-172-31-33-57 .<\/code>ssh<\/code>]$ <\/code>chmod<\/code> 600 authorized_keys<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

The last step is to copy the content of our public key (we used for user ec2-user). Remember that we have created a key pair when we built our linux box (see corresponding blog<\/a>\u00a0) into the authorized_keys under \/home\/oracle\/.ssh\/authorized_keys<\/p>\n

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cd<\/code> \/home\/ec2-user\/<\/code><\/div>\n
cd<\/code> .<\/code>ssh<\/code>\/<\/code><\/div>\n
cat<\/code> authorized_keys >> <\/code>\/home\/oracle\/<\/code>.<\/code>ssh<\/code>\/authorized_keys<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

And now connection \u00a0should be fine with my new user from my workstation using public DNS and putty.
\nTranferring files from my workstation to the AWS instance<\/span><\/b>
\nOne need might be to transfer files from our local workstation to the our AWS instance. We can use WinSCP, we just have to use the key by importing our putty session (we already used to connect) into WinSCP and after we can connect. Launch WinSCP and use Tools option.
\n\"winscp11\"<\/a><\/p>\n

And then select the session we want to import and we should connect with WinSCP
\n\"winscp2\"<\/a>
\n\"winscp3\"<\/a>
\nConnecting to my oracle instance from my workstation
\n<\/span><\/strong>I have installed my oracle software and my database and listener are\u00a0running. How to connect from my workstation? It is like we usually do. We just have to allow connection on the database port (here I am using the default 1521). Security Groups option is used for editing the inbound rules.
\n\"oracle1\"
\n<\/a>Using Add Rule, we can allow connection on port 1521. Of course we can filter the source for the access.
\n\"oracle2\"
\n<\/a><\/p>\n

And using the DNS of my instance I can connect.For this example I am connecting to an oracle express instance XE.
\n\"oracle3\"<\/a><\/p>\n

You have AWS documentation here\u00a0https:\/\/aws.amazon.com\/documentation\/
\n<\/a><\/p>\n

\n","protected":false},"excerpt":{"rendered":"

By Mouhamadou Diaw In a precedent Blog I talked about how to create an AWS linux instance. Some questions can be: How to create a new user and to connect with, how to transfert files from my workstation, how to connect to my oracle instance from my workstation and so on. In this blog I […]<\/p>\n","protected":false},"author":27,"featured_media":9307,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[955],"tags":[977,987],"type_dbi":[],"class_list":["post-9300","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-cloud","tag-amazon-web-services","tag-linux-aws"],"acf":[],"yoast_head":"\nManaging My Amazon Web Services Redhat Instance - dbi Blog<\/title>\n<meta name=\"description\" content=\"Cloud, Amazon Web Services, AWS\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.dbi-services.com\/blog\/managing-my-amazon-web-services-redhat-instance\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Managing My Amazon Web Services Redhat Instance\" \/>\n<meta property=\"og:description\" content=\"Cloud, Amazon Web Services, AWS\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.dbi-services.com\/blog\/managing-my-amazon-web-services-redhat-instance\/\" \/>\n<meta property=\"og:site_name\" content=\"dbi Blog\" \/>\n<meta property=\"article:published_time\" content=\"2016-11-15T15:20:21+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2023-06-08T13:22:43+00:00\" \/>\n<meta property=\"og:image\" content=\"http:\/\/www.dbi-services.com\/blog\/wp-content\/uploads\/sites\/2\/2022\/04\/winscp1.png\" \/>\n\t<meta property=\"og:image:width\" content=\"1107\" \/>\n\t<meta property=\"og:image:height\" content=\"682\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"Oracle Team\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Oracle Team\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"4 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.dbi-services.com\/blog\/managing-my-amazon-web-services-redhat-instance\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.dbi-services.com\/blog\/managing-my-amazon-web-services-redhat-instance\/\"},\"author\":{\"name\":\"Oracle Team\",\"@id\":\"https:\/\/www.dbi-services.com\/blog\/#\/schema\/person\/66ab87129f2d357f09971bc7936a77ee\"},\"headline\":\"Managing My Amazon Web Services Redhat Instance\",\"datePublished\":\"2016-11-15T15:20:21+00:00\",\"dateModified\":\"2023-06-08T13:22:43+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.dbi-services.com\/blog\/managing-my-amazon-web-services-redhat-instance\/\"},\"wordCount\":454,\"commentCount\":0,\"image\":{\"@id\":\"https:\/\/www.dbi-services.com\/blog\/managing-my-amazon-web-services-redhat-instance\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/www.dbi-services.com\/blog\/wp-content\/uploads\/sites\/2\/2022\/04\/winscp1.png\",\"keywords\":[\"Amazon Web Services\",\"Linux AWS\"],\"articleSection\":[\"Cloud\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/www.dbi-services.com\/blog\/managing-my-amazon-web-services-redhat-instance\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.dbi-services.com\/blog\/managing-my-amazon-web-services-redhat-instance\/\",\"url\":\"https:\/\/www.dbi-services.com\/blog\/managing-my-amazon-web-services-redhat-instance\/\",\"name\":\"Managing My Amazon Web Services Redhat Instance - 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