# Create a cluster node availability check When creating a cluster or adding nodes to an existing cluster, refer to the table below to check the node configuration to avoid cluster creation or expansion failure due to wrong node configuration. | Check Item | Description | | ---------- | ----------- | | OS | Refer to [Supported Architectures and Operating Systems](#supported-architectures-and-operating-systems) | | SELinux | Off | | Firewall | Off | | Architecture Consistency | Consistent CPU architecture between nodes (such as ARM or x86) | | Host Time | All hosts are out of sync within 10 seconds. | | Network Connectivity | The node and its SSH port can be accessed normally by the platform. | | CPU | Available CPU resources are greater than 4 Cores | | Memory | Available memory resources are greater than 8 GB | ## Supported architectures and operating systems | Architecture | Operating System | Remarks | | ---- | ------------------------ | ---- | | ARM | Kylin Linux Advanced Server release V10 (Sword) SP2 | Recommended | | ARM | UOS Linux | | | ARM | openEuler | | | x86 | CentOS 7.x | Recommended | | x86 | Redhat 7.x | Recommended | | x86 | Redhat 8.x | Recommended | | x86 | Flatcar Container Linux by Kinvolk | | | x86 | Debian Bullseye, Buster, Jessie, Stretch | | | x86 | Ubuntu 16.04, 18.04, 20.04, 22.04 | | | x86 | Fedora 35, 36 | | | x86 | Fedora CoreOS | | | x86 | openSUSE Leap 15.x/Tumbleweed | | | x86 | Oracle Linux 7, 8, 9 | | | x86 | Alma Linux 8, 9 | | | x86 | Rocky Linux 8, 9 | | | x86 | Amazon Linux 2 | | | x86 | Kylin Linux Advanced Server release V10 (Sword) - SP2 Haiguang | | | x86 | UOS Linux | | | x86 | openEuler | |