#zypper install docker SLES15 SP2 nodes SLES15 SP2 Ensure that the nodes are accessed using SSH and the required ports must be opened before the cluster installation. https://rancher.com/docs/rke/l solution, RKE is run from a Linux workstation VM. RKE connects to the nodes using SSH key pairs. Note: Make sure that the SSH login that is used for node access is a member of the docker group on the node node: $ useradd -m -G docker $ su - $ mkdir $HOME/.ssh $ chmod 600 $HOME/.ssh $ touch $HOME/.ssh/authorized_keys 4. Run the following command to test the docker socket

ingress_backend: "" metrics_server: "" windows_pod_infra_container: "" ssh_key_path: "" ssh_cert_path: "" ssh_agent_auth: false authorization: mode: "" options: {} ignore_docker_version: 0 bastion_host: address: "" port: "" user: "" ssh_key: "" ssh_key_path: "" ssh_cert: "" Hardening Guide v2.3.5 13 ssh_cert_path: "" monitoring: provider: "" options: {} Hardening Guide v2.3.5 20 extra_args: address: 127.0.0.1 profiling: 'false' ssh_agent_auth: false windows_prefered_cluster: false Hardened Reference Ubuntu 18.04 LTS cloud-config:

ingress_backend: "" metrics_server: "" windows_pod_infra_container: "" ssh_key_path: "" ssh_cert_path: "" ssh_agent_auth: false authorization: mode: "" options: {} ignore_docker_version: addon_job_timeout: 0 bastion_host: address: "" port: "" user: "" ssh_key: "" ssh_key_path: "" ssh_cert: "" ssh_cert_path: "" monitoring: provider: "" options: {} node_selector: true scheduler: extra_args: address: 127.0.0.1 profiling: 'false' ssh_agent_auth: false windows_prefered_cluster: false Hardened Reference Ubuntu 18.04 LTS cloud-config:

"worker" ] addon_job_timeout: 30 authentication: strategy: x509 authorization: {} bastion_host: ssh_agent_auth: false cloud_provider: {} ignore_docker_version: true # # # Currently only nginx ingress generate_serving_certificate: true kubeproxy: {} scheduler: extra_args: address: 127.0.0.1 profiling: 'false' ssh_agent_auth: false {{% /ac c or d i on % }} {{% ac c or d i on i d = “c l u s t e r - 1. 15” l ab "RotateKubeletServerCertificate=true" scheduler: extra_args: profiling: "false" address: "127.0.0.1" ssh_agent_auth: false {{% /ac c or d i on % }} {{% ac c or d i on i d = “c l u s t e r - 1. 16” l ab

https://kubernetes.io/docs/tasks/administer-cluster/dns-debugging-resolution/ #known-issues 18 • SSH connectivity including root SSH access • NTP (must be chrony) The cluster nodes in our examples are running Ubuntu cluster example is an Ubuntu host reachable at IP address 172.16.0.11. 1. From your local computer, SSH into the server node as the root user. 59 2. Create a config.yaml file at /etc/rancher/rke2 with 172.16.0.12 and 172.16.0.13. NOTE: Repeat these steps for the desired amount of agent nodes. 1. SSH into the agent node as the root user. 2. Create a config.yaml file in the /etc/rancher/rke2 directory

16 17 18 Secret Management Challenges ● Secrets sprawl ● Secrets rotation ● X.509 certificates, SSH and Cloud access ● Encryption ● Multi-platform and multi-cloud ● Central control and management ● AliCloud Kubernetes Cloud Foundry AppRole Databases Public Cloud Consul / Nomad X.509 Certs RabbitMQ SSH / Active Directory Encrypt / Decrypt Format-preserving encryption Sign / Verify HMAC Masking Key

由于ConfigMap是明文存储，适合用来存储非安全的配置信息，如果 涉及安全敏感的数据，推荐使用另一个Secret资源对象。Secret 对象 用来保存敏感信息，例如密码、OAuth 令牌和 SSH 密钥，这些信息放 在Secret中比放在Pod的定义或者容器镜像中更加安全和灵活。 Secret 主要使用的有以下三种类型： • Opaque： base64 编码格式的 Secret，用来存储密码、密钥等。

run the command: $ sudo systemctl stop rke2-agent Update SUSE Linux Enterprise Server 15 SP4: $ ssh node $ sudo zypper patch Reboot the nodes if necessary or start the appropriate RKE 2 service. On

cater to various use cases. 1.3.3 Secret Management Applications use secrets such as passwords, SSH keys and API tokens all the time. To prevent disclosing the secrets in the definition files that define