{"id":8064,"date":"2016-05-30T17:50:04","date_gmt":"2016-05-30T15:50:04","guid":{"rendered":"https:\/\/www.dbi-services.com\/blog\/install-oracle-12c-flex-cluster-easily\/"},"modified":"2023-06-08T15:09:32","modified_gmt":"2023-06-08T13:09:32","slug":"install-oracle-12c-flex-cluster-easily","status":"publish","type":"post","link":"https:\/\/www.dbi-services.com\/blog\/install-oracle-12c-flex-cluster-easily\/","title":{"rendered":"Install Oracle 12c Flex Cluster Easily"},"content":{"rendered":"

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

To install a flex cluster (or a flex ASM) \u00a0Grid Naming Service (GNS) is required. A GNS can be configured with dynamic public networks (DHCP) for VIP. This method is suitable for a big number of nodes.In this case GNS domain delegation is mandatory.
\nIn case of a few number of nodes, GNS can be configured without domain delegation. In this case we have to define manually all VIP addresses (like in a standard cluster)<\/p>\n

In this article we will briefly show how to install\u00a0a two nodes flex cluster (we suppose we are\u00a0\u00a0familiar with standard cluster installation). We will just insist in supplementary steps to configure a flex cluster. A\u00a0GNS without Subdomain will be used.<\/p>\n

What do we need ?<\/h4>\n

1- A DNS server to resolve all addresses<\/strong><\/p>\n

2- Two servers: rac12a.localdomain<\/strong> and rac12b.localdomain<\/strong> with 1 public address, 1 virtual address and 1 private address for each node<\/p>\n

3- A GNS Subdomain: gns.localdomain<\/strong>\u00a0 resolved by 1\u00a0address in the public subnet \u00a0in \u00a0the\u00a0\u00a0DNS<\/p>\n

4- A scan name : racscan.gns.localdomain<\/strong> resolved by 3 addresses in the public\u00a0subnet. Note that the name of the scan should contain the GNS subdomain name gns.localdomain<\/strong>.<\/p>\n

We present below all IP addresses we use for our flex cluster<\/p>\n

\"ip_addr\"<\/a><\/p>\n

To start installation we have to launch the \u00a0.\/runInstaller file. Below we will not present all screen shots of the installation. We \u00a0only\u00a0show the ones which are different from the standard installation<\/p>\n

\"flex_1\"<\/a><\/p>\n

Click Next<\/p>\n

\"flex_2\"<\/a><\/p>\n

We choose Configure a flex cluster<\/p>\n

\"flex_4\"<\/a><\/p>\n

In this step we have info about GNS \u00a0and SCAN configuration. Note that We check Configure GNS and that we don’t choose Dynamic Networks. Note also that the scan name is including the GNS Subdomain name.<\/p>\n

\"flex_5\"<\/a><\/p>\n

Here we can choose to \u00a0configure a hub node or a leaf node.<\/p>\n

\"flex_6\"<\/a><\/p>\n

In this step we have to specify network for public, private and ASM.<\/p>\n

The remaining steps are same than in a standard installation and will not be shown here<\/p>\n

Once install done successfully we can verify the mode of the cluster<\/p>\n

\n
\n\n\n\n
\n
1<\/div>\n
2<\/div>\n
3<\/div>\n<\/td>\n
\n
\n
[grid@rac12a ~]$ crsctl get cluster mode status<\/code><\/div>\n
Cluster <\/code>is<\/code> running <\/code>in<\/code> \"flex\"<\/code> mode<\/code><\/div>\n
[grid@rac12a ~]$<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

We can see that a GNS is configured<\/p>\n

\n
\n\n\n\n
\n
1<\/div>\n
2<\/div>\n
3<\/div>\n
4<\/div>\n
5<\/div>\n<\/td>\n
\n
\n
[grid@rac12a ~]$ srvctl config gns<\/code><\/div>\n
GNS <\/code>is<\/code> enabled.<\/code><\/div>\n
GNS VIP addresses: 192.168.168.118<\/code><\/div>\n
Domain served <\/code>by<\/code> GNS: gns.localdomain<\/code><\/div>\n
[grid@rac12a ~]$<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

The following shows that there is a flex ASM running<\/p>\n

\n
\n\n\n\n
\n
1<\/div>\n
2<\/div>\n
3<\/div>\n<\/td>\n
\n
\n
\u00a0<\/code>[grid@rac12a ~]$ asmcmd showclustermode<\/code><\/div>\n
ASM cluster : Flex mode enabled<\/code><\/div>\n
[grid@rac12a ~]<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

In a future article \u00a0we will see how flex ASM works and what are the benefits<\/p>\n","protected":false},"excerpt":{"rendered":"

By Mouhamadou Diaw To install a flex cluster (or a flex ASM) \u00a0Grid Naming Service (GNS) is required. A GNS can be configured with dynamic public networks (DHCP) for VIP. This method is suitable for a big number of nodes.In this case GNS domain delegation is mandatory. In case of a few number of nodes, […]<\/p>\n","protected":false},"author":27,"featured_media":8071,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[229],"tags":[],"type_dbi":[],"class_list":["post-8064","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-database-administration-monitoring"],"acf":[],"yoast_head":"\nInstall Oracle 12c Flex Cluster Easily - dbi Blog<\/title>\n<meta name=\"description\" content=\"Oracle GNS, Flex cluster, oracle 12c\" \/>\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\/install-oracle-12c-flex-cluster-easily\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Install Oracle 12c Flex Cluster Easily\" \/>\n<meta property=\"og:description\" content=\"Oracle GNS, Flex cluster, oracle 12c\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.dbi-services.com\/blog\/install-oracle-12c-flex-cluster-easily\/\" \/>\n<meta property=\"og:site_name\" content=\"dbi Blog\" \/>\n<meta property=\"article:published_time\" content=\"2016-05-30T15:50:04+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2023-06-08T13:09:32+00:00\" \/>\n<meta property=\"og:image\" content=\"http:\/\/www.dbi-services.com\/blog\/wp-content\/uploads\/sites\/2\/2022\/04\/flex_1-1.png\" \/>\n\t<meta property=\"og:image:width\" content=\"1000\" \/>\n\t<meta property=\"og:image:height\" content=\"790\" \/>\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\/install-oracle-12c-flex-cluster-easily\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.dbi-services.com\/blog\/install-oracle-12c-flex-cluster-easily\/\"},\"author\":{\"name\":\"Oracle Team\",\"@id\":\"https:\/\/www.dbi-services.com\/blog\/#\/schema\/person\/66ab87129f2d357f09971bc7936a77ee\"},\"headline\":\"Install Oracle 12c Flex Cluster Easily\",\"datePublished\":\"2016-05-30T15:50:04+00:00\",\"dateModified\":\"2023-06-08T13:09:32+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.dbi-services.com\/blog\/install-oracle-12c-flex-cluster-easily\/\"},\"wordCount\":384,\"commentCount\":0,\"image\":{\"@id\":\"https:\/\/www.dbi-services.com\/blog\/install-oracle-12c-flex-cluster-easily\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/www.dbi-services.com\/blog\/wp-content\/uploads\/sites\/2\/2022\/04\/flex_1-1.png\",\"articleSection\":[\"Database Administration & Monitoring\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/www.dbi-services.com\/blog\/install-oracle-12c-flex-cluster-easily\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.dbi-services.com\/blog\/install-oracle-12c-flex-cluster-easily\/\",\"url\":\"https:\/\/www.dbi-services.com\/blog\/install-oracle-12c-flex-cluster-easily\/\",\"name\":\"Install Oracle 12c Flex Cluster Easily - 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