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Product Bulletin
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Vulnerability Notices
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- Notice of Container Escape Vulnerability in NVIDIA Container Toolkit (CVE-2024-0132)
- Notice of Linux Remote Code Execution Vulnerability in CUPS (CVE-2024-47076, CVE-2024-47175, CVE-2024-47176, and CVE-2024-47177)
- Notice of the NGINX Ingress Controller Vulnerability That Allows Attackers to Bypass Annotation Validation (CVE-2024-7646)
- Notice of Docker Engine Vulnerability That Allows Attackers to Bypass AuthZ (CVE-2024-41110)
- Notice of Linux Kernel Privilege Escalation Vulnerability (CVE-2024-1086)
- Notice of OpenSSH Remote Code Execution Vulnerability (CVE-2024-6387)
- Notice of runC systemd Attribute Injection Vulnerability (CVE-2024-3154)
- Notice of the Impact of runC Vulnerability (CVE-2024-21626)
- Notice on the Kubernetes Security Vulnerability (CVE-2022-3172)
- Privilege Escalation Vulnerability in Linux Kernel openvswitch Module (CVE-2022-2639)
- Notice on nginx-ingress Add-On Security Vulnerability (CVE-2021-25748)
- Notice on nginx-ingress Security Vulnerabilities (CVE-2021-25745 and CVE-2021-25746)
- Notice on the containerd Process Privilege Escalation Vulnerability (CVE-2022-24769)
- Notice on CRI-O Container Runtime Engine Arbitrary Code Execution Vulnerability (CVE-2022-0811)
- Notice on the Container Escape Vulnerability Caused by the Linux Kernel (CVE-2022-0492)
- Notice on the Non-Security Handling Vulnerability of containerd Image Volumes (CVE-2022-23648)
- Linux Kernel Integer Overflow Vulnerability (CVE-2022-0185)
- Linux Polkit Privilege Escalation Vulnerability (CVE-2021-4034)
- Notice on the Vulnerability of Kubernetes subPath Symlink Exchange (CVE-2021-25741)
- Notice of runC Vulnerability That Allows a Container Filesystem Breakout via Directory Traversal (CVE-2021-30465)
- Notice on the Docker Resource Management Vulnerability (CVE-2021-21285)
- Notice of NVIDIA GPU Driver Vulnerability (CVE-2021-1056)
- Notice on the Sudo Buffer Vulnerability (CVE-2021-3156)
- Notice on the Kubernetes Security Vulnerability (CVE-2020-8554)
- Notice of Apache containerd Security Vulnerability (CVE-2020-15257)
- Notice on the Docker Engine Input Verification Vulnerability (CVE-2020-13401)
- Notice of Kubernetes kube-apiserver Input Verification Vulnerability (CVE-2020-8559)
- Notice on the Kubernetes kubelet Resource Management Vulnerability (CVE-2020-8557)
- Notice on the Kubernetes kubelet and kube-proxy Authorization Vulnerability (CVE-2020-8558)
- Notice on Fixing Kubernetes HTTP/2 Vulnerability
- Notice on Fixing Linux Kernel SACK Vulnerabilities
- Notice on Fixing the Docker Command Injection Vulnerability (CVE-2019-5736)
- Notice on Fixing the Kubernetes Permission and Access Control Vulnerability (CVE-2018-1002105)
- Notice of Fixing the Kubernetes Dashboard Security Vulnerability (CVE-2018-18264)
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Product Release Notes
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Cluster Versions
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Kubernetes Version Release Notes
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Add-on Versions
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Cluster Versions
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User Guide
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Clusters
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Cluster Overview
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Kubernetes Version Release Notes
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- Patch Version Release Notes
- Buying a Cluster
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Managing a Cluster
- Modifying Cluster Configurations
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- Renewing a Yearly/Monthly Cluster
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Upgrading a Cluster
- Process and Method of Upgrading a Cluster
- Before You Start
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Troubleshooting for Pre-upgrade Check Exceptions
- Pre-upgrade Check
- Node Restrictions
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Cluster Overview
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Nodes
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Management Nodes
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Node O&M
- Node Resource Reservation Policy
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- Differences in kubelet and Runtime Component Configurations Between CCE and the Native Community
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Workloads
- Overview
- Creating a Workload
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Configuring a Workload
- Configuring Time Zone Synchronization
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Network
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Container Network
- Overview
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Cloud Native Network 2.0 Settings
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Service
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LoadBalancer
- Creating a LoadBalancer Service
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- Headless Services
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Ingresses
- Overview
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LoadBalancer Ingresses
- Creating a LoadBalancer Ingress on the Console
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- Annotations for Configuring LoadBalancer Ingresses
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Advanced Setting Examples of LoadBalancer Ingresses
- Configuring an HTTPS Certificate for a LoadBalancer Ingress
- Configuring SNI for a LoadBalancer Ingress
- Configuring Multiple Forwarding Policies for a LoadBalancer Ingress
- Configuring HTTP/2 for a LoadBalancer Ingress
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- Nginx Ingresses
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Old Console
- What Is Cloud Container Engine?
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Nodes
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- Buying a Node
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- Formula for Calculating the Reserved Resources of a Node
- Creating a Linux LVM Disk Partition for Docker
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- Node Pools
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Workloads
- Overview
- Creating a Deployment
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Configuring a Container
- Using a Third-Party Image
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Best Practices
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Security
- Configuration Suggestions on CCE Cluster Security
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API Reference
- Before You Start
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APIs
- API URL
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Cluster Management
- Creating a Cluster
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Cluster Upgrade
- Upgrading a Cluster
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- Obtaining a List of Cluster Upgrade Task Details
- Pre-upgrade Check
- Obtaining Details About a Pre-upgrade Check Task of a Cluster
- Obtaining a List of Pre-upgrade Check Tasks of a Cluster
- Post-upgrade Check
- Cluster Backup
- Obtaining a List of Cluster Backup Task Details
- Obtaining the Cluster Upgrade Information
- Obtaining a Cluster Upgrade Path
- Obtaining the Configuration of Cluster Upgrade Feature Gates
- Enabling the Cluster Upgrade Process Booting Task
- Obtaining a List of Upgrade Workflows
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Chart Management
- Uploading a Chart
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- Obtaining the Quota of a User Chart
- Kubernetes APIs
- Permissions and Supported Actions
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Appendix
- Status Code
- Error Codes
- Obtaining a Project ID
- Obtaining an Account ID
- Specifying Add-ons to Be Installed During Cluster Creation
- How to Obtain Parameters in the API URI
- Creating a VPC and Subnet
- Creating a Key Pair
- Node Flavor Description
- Adding a Salt in the password Field When Creating a Node
- Maximum Number of Pods That Can Be Created on a Node
- Node OS
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- Attaching Disks to a Node
- SDK Reference
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FAQs
- Common FAQ
- Billing
- Cluster
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Node
- Node Creation
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Node Running
- What Should I Do If a Cluster Is Available But Some Nodes Are Unavailable?
- How Do I Log In to a Node Using a Password and Reset the Password?
- How Do I Collect Logs of Nodes in a CCE Cluster?
- What Should I Do If the vdb Disk of a Node Is Damaged and the Node Cannot Be Recovered After Reset?
- What Should I Do If I/O Suspension Occasionally Occurs When SCSI EVS Disks Are Used?
- How Do I Fix an Abnormal Container or Node Due to No Thin Pool Disk Space?
- How Do I Rectify Failures When the NVIDIA Driver Is Used to Start Containers on GPU Nodes?
- Specification Change
- OSs
- Node Pool
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Workload
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Workload Exception Troubleshooting
- How Can I Find the Fault for an Abnormal Workload?
- What Should I Do If Pod Scheduling Fails?
- What Should I Do If a Pod Fails to Pull the Image?
- What Should I Do If Container Startup Fails?
- What Should I Do If a Pod Fails to Be Evicted?
- What Should I Do If a Storage Volume Cannot Be Mounted or the Mounting Times Out?
- What Should I Do If a Workload Remains in the Creating State?
- What Should I Do If a Pod Remains in the Terminating State?
- What Should I Do If a Workload Is Stopped Caused by Pod Deletion?
- What Should I Do If an Error Occurs When I Deploy a Service on the GPU Node?
- How Can I Locate Faults Using an Exit Code?
- Container Configuration
- Scheduling Policies
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Others
- What Should I Do If a Cron Job Cannot Be Restarted After Being Stopped for a Period of Time?
- What Is a Headless Service When I Create a StatefulSet?
- What Should I Do If Error Message "Auth is empty" Is Displayed When a Private Image Is Pulled?
- What Is the Image Pull Policy for Containers in a CCE Cluster?
- What Can I Do If a Layer Is Missing During Image Pull?
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Workload Exception Troubleshooting
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Networking
-
Network Exception Troubleshooting
- How Do I Locate a Workload Networking Fault?
- Why Does the Browser Return Error Code 404 When I Access a Deployed Application?
- What Should I Do If a Container Fails to Access the Internet?
- What Should I Do If a Node Fails to Connect to the Internet (Public Network)?
- What Should I Do If Nginx Ingress Access in the Cluster Is Abnormal After the NGINX Ingress Controller Add-on Is Upgraded?
- What Could Cause Access Exceptions After Configuring an HTTPS Certificate for a LoadBalancer Ingress?
- Network Planning
- Security Hardening
-
Network Configuration
- How Can Container IP Addresses Survive a Container Restart?
- How Can I Check Whether an ENI Is Used by a Cluster?
- How Can I Delete a Security Group Rule Associated with a Deleted Subnet?
- How Can I Synchronize Certificates When Multiple Ingresses in Different Namespaces Share a Listener?
- How Can I Determine Which Ingress the Listener Settings Have Been Applied To?
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Network Exception Troubleshooting
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Storage
- How Do I Expand the Storage Capacity of a Container?
- What Are the Differences Among CCE Storage Classes in Terms of Persistent Storage and Multi-Node Mounting?
- Can I Create a CCE Node Without Adding a Data Disk to the Node?
- What Should I Do If the Host Cannot Be Found When Files Need to Be Uploaded to OBS During the Access to the CCE Service from a Public Network?
- How Can I Achieve Compatibility Between ExtendPathMode and Kubernetes client-go?
- Can CCE PVCs Detect Underlying Storage Faults?
- What Should I Do If a Yearly/Monthly EVS Disk Cannot Be Automatically Created?
- Namespace
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Chart and Add-on
- What Should I Do If Installation of an Add-on Fails and "The release name is already exist" Is Displayed?
- How Do I Configure the Add-on Resource Quotas Based on Cluster Scale?
- How Can I Clean Up Residual Resources After the NGINX Ingress Controller Add-on in the Unknown State Is Deleted?
- Why TLS v1.0 and v1.1 Cannot Be Used After the NGINX Ingress Controller Add-on Is Upgraded?
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API & kubectl FAQs
- How Can I Access a Cluster API Server?
- Can the Resources Created Using APIs or kubectl Be Displayed on the CCE Console?
- How Do I Download kubeconfig for Connecting to a Cluster Using kubectl?
- How Do I Rectify the Error Reported When Running the kubectl top node Command?
- Why Is "Error from server (Forbidden)" Displayed When I Use kubectl?
- DNS FAQs
- Image Repository FAQs
- Permissions
- Videos
- Mechanism for Detecting Node Unavailability
- Troubleshooting Process
- Check Item 1: Whether the Node Is Overloaded
- Check Item 2: Whether the ECS Is Deleted or Faulty
- Check Item 3: Whether You Can Log In to the ECS
- Check Item 4: Whether the Security Group Is Modified
- Check Item 5: Whether the Security Group Rules Contain the Security Group Policy for the Communication Between the Master Node and the Worker Node
- Check Item 6: Whether the Disk Is Abnormal
- Check Item 7: Whether Internal Components Are Normal
- Check Item 8: Whether the DNS Address Is Correct
- Check Item 9: Whether the vdb Disk on the Node Is Deleted
- Check Item 10: Whether the Docker Service Is Normal
- Check Item 11: Whether a Yearly/Monthly Node Is Being Unsubscribed
Show all
What Should I Do If a Cluster Is Available But Some Nodes Are Unavailable?
If the cluster status is available but some nodes in the cluster are unavailable, perform the following operations to rectify the fault.
Mechanism for Detecting Node Unavailability
Kubernetes provides the heartbeat mechanism to help you determine node availability. For details about the mechanism and interval, see Heartbeats.
Troubleshooting Process
The issues here are described in order of how likely they are to occur.
Check these causes one by one until you find the cause of the fault.
- Check Item 1: Whether the Node Is Overloaded
- Check Item 2: Whether the ECS Is Deleted or Faulty
- Check Item 3: Whether You Can Log In to the ECS
- Check Item 4: Whether the Security Group Is Modified
- Check Item 5: Whether the Security Group Rules Contain the Security Group Policy for the Communication Between the Master Node and the Worker Node
- Check Item 6: Whether the Disk Is Abnormal
- Check Item 7: Whether Internal Components Are Normal
- Check Item 8: Whether the DNS Address Is Correct
- Check Item 9: Whether the vdb Disk on the Node Is Deleted
- Check Item 10: Whether the Docker Service Is Normal
- Check Item 11: Whether a Yearly/Monthly Node Is Being Unsubscribed
Check Item 1: Whether the Node Is Overloaded
Symptom
The node connection in the cluster is abnormal. Multiple nodes report write errors, but services are not affected.
Fault Locating
- Log in to the CCE console and click the cluster name to access the cluster console. In the navigation pane, choose Nodes and click the Nodes tab. Locate the row that contains the unavailable node and click Monitor.
- On the top of the displayed page, click View More to go to the AOM console and view historical monitoring records.
A too high CPU or memory usage of the node will result in a high network latency or trigger system OOM. Therefore, the node is displayed as unavailable.
Solution
- Migrate services to reduce the workloads on the node and configure resource limits for the workloads.
- Clear data on the CCE nodes in the cluster.
- Limit the CPU and memory quotas of each container.
- Add more nodes to the cluster.
- Restart the node on the ECS console.
- Add nodes to deploy memory-intensive containers separately.
- Reset the nodes.
After the nodes become available, the workload is restored.
Check Item 2: Whether the ECS Is Deleted or Faulty
- Check whether the cluster is available.
Log in to the CCE console and check whether the cluster is available.
- If the cluster is unavailable, for example, an error occurs, perform operations described in How Do I Locate the Fault When a Cluster Is Unavailable?
- If the cluster is running but some nodes in the cluster are unavailable, go to 2.
- Log in to the ECS console and view the ECS status.
- If the ECS status is Deleted, go back to the CCE console, delete the corresponding node from the node list of the cluster, and then create another one.
- If the ECS status is Stopped or Frozen, restore the ECS first. It takes about 3 minutes to restore the ECS.
- If the ECS is Faulty, restart the ECS to rectify the fault.
- If the ECS status is Running, log in to the ECS to locate the fault according to Check Item 7: Whether Internal Components Are Normal.
Check Item 3: Whether You Can Log In to the ECS
- Log in to the ECS console.
- Check whether the node name displayed on the page is the same as that on the VM and whether the password or key can be used to log in to the node.
If the node names are inconsistent and the password and key cannot be used to log in to the node, Cloud-Init problems occurred when an ECS was created. In this case, restart the node and submit a service ticket to the ECS personnel to locate the root cause.
Check Item 4: Whether the Security Group Is Modified
Log in to the VPC console. In the navigation pane, choose Access Control > Security Groups and locate the security group of the cluster master node.
The name of this security group is in the format of Cluster name-cce-control-ID. You can search for the security group by cluster name and -cce-control-.
Check whether the security group rules have been modified. For details about security groups, see How Can I Configure a Security Group Rule in a Cluster?
Check Item 5: Whether the Security Group Rules Contain the Security Group Policy for the Communication Between the Master Node and the Worker Node
Check whether such a security group policy exists.
When a node is added to an existing cluster, if an extended CIDR block is added to the VPC corresponding to the subnet and the subnet is an extended CIDR block, you need to add the following three security group rules to the master node security group (the group name is in the format of Cluster name-cce-control-Random number). These rules ensure that the nodes added to the cluster are available. (This step is not required if an extended CIDR block has been added to the VPC during cluster creation.)
For details about security groups, see How Can I Configure a Security Group Rule in a Cluster?
Check Item 6: Whether the Disk Is Abnormal
A 100-GiB data disk dedicated for Docker is attached to the new node. If the data disk is uninstalled or damaged, the Docker service becomes abnormal and the node becomes unavailable.
Click the node name to check whether the data disk mounted to the node is uninstalled. If the disk is uninstalled, mount a data disk to the node again and restart the node. Then the node can be recovered.
Check Item 7: Whether Internal Components Are Normal
- Log in to the ECS where the unavailable node is located.
- Run the following command to check whether the PaaS components are normal:
systemctl status kubelet
If the command is successfully executed, the status of each component is displayed as active, as shown in the following figure.
If the component status is not active, run the following commands (using the faulty component canal as an example):
Run systemctl restart canal to restart the component.
After restarting the component, run systemctl status canal to check the status.
- If the restart command fails to be run, run the following command to check the running status of the monitrc process:
ps -ef | grep monitrc
If the monitrc process exists, run the following command to kill this process. The monitrc process will be automatically restarted after it is killed.
kill -s 9 `ps -ef | grep monitrc | grep -v grep | awk '{print $2}'`
Check Item 8: Whether the DNS Address Is Correct
- After logging in to the node, check whether any domain name resolution failure is recorded in the /var/log/cloud-init-output.log file.
cat /var/log/cloud-init-output.log | grep resolv
If the command output contains the following information, the domain name cannot be resolved:
Could not resolve host: Unknown error
- On the node, ping the domain name that cannot be resolved in the previous step to check whether the domain name can be resolved on the node.
- If not, the DNS cannot resolve the IP address. Check whether the DNS address in the /etc/resolv.conf file is the same as that configured on the VPC subnet. In most cases, the DNS address in the file is incorrectly configured. As a result, the domain name cannot be resolved. Correct the DNS configuration of the VPC subnet and reset the node.
- If yes, the DNS address configuration is correct. Check whether there are other faults.
Check Item 9: Whether the vdb Disk on the Node Is Deleted
If the vdb disk on a node is deleted, you can refer to this topic to restore the node.
Check Item 10: Whether the Docker Service Is Normal
- Run the following command to check whether the Docker service is running:
systemctl status docker
If the command fails or the Docker service status is not active, locate the cause or contact technical support if necessary.
- Run the following command to check the number of containers on the node:
docker ps -a | wc -l
If the command is suspended, the command execution takes a long time, or there are more than 1000 abnormal containers, check whether workloads are repeatedly created and deleted. If a large number of containers are frequently created and deleted, there may be a large number of abnormal containers, and these containers cannot be cleared in a timely manner.
In this case, stop repeated creation and deletion of the workload or use more nodes to share the workload. Generally, the nodes will be restored after a period of time. If necessary, run the docker rm {container_id} command to manually clear abnormal containers.
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