{"id":27706,"date":"2024-03-16T09:04:20","date_gmt":"2024-03-16T09:04:20","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/how-to-set-up-a-hadoop-cluster-on-centos-7\/"},"modified":"2024-03-22T11:41:11","modified_gmt":"2024-03-22T11:41:11","slug":"how-to-set-up-a-hadoop-cluster-on-centos-7","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/how-to-set-up-a-hadoop-cluster-on-centos-7\/","title":{"rendered":"How to set up a Hadoop cluster on CentOS 7"},"content":{"rendered":"

Setting up a Hadoop cluster involves the following steps:<\/p>\n

    \n
  1. Install Java: Install Java on all nodes and set the correct JAVA_HOME environment variable.<\/li>\n
  2. Download Hadoop: Download the binary package of Hadoop from the official Apache website and extract it to the same directory on all nodes.<\/li>\n
  3. Setting up Hadoop: Navigate to the installation directory of Hadoop, edit the etc\/hadoop\/core-site.xml file, and add the following configuration:<\/li>\n<\/ol>\n
    <configuration<\/span>><\/span>\r\n    <property<\/span>><\/span>\r\n        <name<\/span>><\/span>fs.defaultFS<\/name<\/span>><\/span>\r\n        <value<\/span>><\/span>hdfs:\/\/namenode_hostname:9000<\/value<\/span>><\/span>  <!-- namenode_hostname\u4e3a\u4e3b\u8282\u70b9\u7684\u4e3b\u673a\u540d --><\/span>\r\n    <\/property<\/span>><\/span>\r\n<\/configuration<\/span>><\/span>\r\n<\/code><\/pre>\n
    Then modify the file \/etc\/hadoop\/hdfs-site.xml and add the following configuration:<\/p>\n
    <configuration<\/span>><\/span>\r\n    <property<\/span>><\/span>\r\n        <name<\/span>><\/span>dfs.replication<\/name<\/span>><\/span>\r\n        <value<\/span>><\/span>3<\/value<\/span>><\/span>  <!-- \u8bbe\u7f6e\u526f\u672c\u6570\u91cf --><\/span>\r\n    <\/property<\/span>><\/span>\r\n    <property<\/span>><\/span>\r\n        <name<\/span>><\/span>dfs.namenode.name.dir<\/name<\/span>><\/span>\r\n        <value<\/span>><\/span>\/data\/hadoop\/dfs\/name<\/value<\/span>><\/span>  <!-- \u8bbe\u7f6e\u4e3b\u8282\u70b9\u7684\u6570\u636e\u5b58\u50a8\u8def\u5f84 --><\/span>\r\n    <\/property<\/span>><\/span>\r\n    <property<\/span>><\/span>\r\n        <name<\/span>><\/span>dfs.datanode.data.dir<\/name<\/span>><\/span>\r\n        <value<\/span>><\/span>\/data\/hadoop\/dfs\/data<\/value<\/span>><\/span>  <!-- \u8bbe\u7f6e\u4ece\u8282\u70b9\u7684\u6570\u636e\u5b58\u50a8\u8def\u5f84 --><\/span>\r\n    <\/property<\/span>><\/span>\r\n<\/configuration<\/span>><\/span>\r\n<\/code><\/pre>\n
    Finally, edit the etc\/hadoop\/mapred-site.xml.template file and save it as etc\/hadoop\/mapred-site.xml, adding the following configuration:<\/p>\n
    <configuration<\/span>><\/span>\r\n    <property<\/span>><\/span>\r\n        <name<\/span>><\/span>mapreduce.framework.name<\/name<\/span>><\/span>\r\n        <value<\/span>><\/span>yarn<\/value<\/span>><\/span>\r\n    <\/property<\/span>><\/span>\r\n<\/configuration<\/span>><\/span>\r\n<\/code><\/pre>\n
      \n
    1. Configure master-slave nodes: Fill in the hostname or IP address of the slave nodes in the etc\/hadoop\/slaves file, one node per line.<\/li>\n
    2. Set up passwordless SSH login: Generate an SSH key pair on the main node and distribute the public key to all nodes, this can be achieved using the ssh-keygen and ssh-copy-id commands.<\/li>\n
    3. Start the Hadoop cluster: Execute the following command on the master node to start the Hadoop cluster.<\/li>\n<\/ol>\n
      sbin\/start-dfs.sh\r\nsbin\/start-yarn.sh\r\n<\/code><\/pre>\n
        \n
      1. The address of the name node is http:\/\/namenode_hostname:50070.<\/li>\n
      2. The hostname of the name node is followed by port 8088.<\/li>\n<\/ol>\n
        The above is a basic process for setting up a Hadoop cluster, specific configurations and adjustments can be modified according to needs.<\/p>\n","protected":false},"excerpt":{"rendered":"
        Setting up a Hadoop cluster involves the following steps: Install Java: Install Java on all nodes and set the correct JAVA_HOME environment variable. Download Hadoop: Download the binary package of Hadoop from the official Apache website and extract it to the same directory on all nodes. Setting up Hadoop: Navigate to the installation directory of […]<\/p>\n","protected":false},"author":12,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_import_markdown_pro_load_document_selector":0,"_import_markdown_pro_submit_text_textarea":"","footnotes":""},"categories":[1],"tags":[],"class_list":["post-27706","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"\nHow to set up a Hadoop cluster on CentOS 7 - Blog - Silicon Cloud<\/title>\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.silicloud.com\/blog\/how-to-set-up-a-hadoop-cluster-on-centos-7\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How to set up a Hadoop cluster on CentOS 7\" \/>\n<meta property=\"og:description\" content=\"Setting up a Hadoop cluster involves the following steps: Install Java: Install Java on all nodes and set the correct JAVA_HOME environment variable. 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