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Health Check

Last updated: 2022-04-18 19:48:56

    Overview

    Health check can check the status of performance, fees, network, and disk utilization of a CVM instance. With this feature, you can discover and solve instance problems promptly.

    Use Cases

    We recommend you use health check in the following two scenarios:

    • Troubleshooting: If any failure or problem occurs during instance operations, you can run a health check to locate and troubleshoot it.
    • All-around instance check: During daily Ops, health check can help you keep up to date with the overall instance running status.

    Check Item Description

    The health check items are as detailed below:

    Local network

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    Check ItemDescriptionRisk
    Level
    Solution
    Network latencyAn HTTP request is sent to check whether the network latency of the instance is high based on the following criteria:
    • If the latency is above 600 ms, the network quality is considered poor.
    • If no response is received within 5s, the request is considered timed out.
    • If all requests time out, the network is considered disconnected.
    ExceptionCheck your local network and solve the problem.
    Network jitterThe average of the differences between the latency values of adjacent requests is the network jitter value. If the network jitter/latency is below or equal to 0.15, the network is stable; otherwise, the network is jittering.-
    Upstream bandwidthData packets are uploaded to the instance to calculate its upstream bandwidth.-
    Downstream bandwidthData packets are downloaded from the instance to calculate its downstream bandwidth.-

    Security group

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    Check ItemDescriptionRisk
    Level
    Solution
    Common portsChecks whether requests to common ports such as ports 22 and 3389 used by the TCP protocol for the inbound traffic are blocked in the security group.WarningIf requests to port 22 used by the TCP protocol are blocked in an ingress rule in the security group, SSH login may be abnormal. You can open the required ports as instructed in Security Group Use Cases.

    Billing

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    Check ItemDescriptionRisk
    Level
    Solution
    Cloud disk statusChecks whether cloud disks associated with the instance have expired and whether they can be read/written.ExceptionA cloud disk associated with the instance has expired. Go to the CBS console to renew it as soon as possible.
    Checks whether cloud disks associated with the pay-as-you-go instance are unavailable due to expiration.WarningAuto-Renewal is not enabled for the cloud disks attached to the instance. Go to the CBS console to configure auto-renewal for the cloud disk.

    Instance storage

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    Check ItemDescriptionRisk
    Level
    Solution
    High cloud disk latencyChecks whether the I/O performance metric svctm is abnormal.WarningA cloud disk associated with the instance has a high latency. We recommend you pay attention to the cloud disk usage.
    Cloud disk I/OChecks for cloud disk I/O hangWarningA cloud disk associated with the instance has an I/O hang. We recommend you pay attention to the cloud disk usage.
    System disk inode utilizationChecks whether the inode utilization of the cloud disk has reached 100%.WarningPay attention to the cloud disk usage and troubleshoot as instructed in Kernel and I/O Issues.
    System disk read-onlyChecks whether the cloud disk is read-only.Exception
    System disk space utilizationChecks whether the utilization of the cloud disk has reached 100%.Warning
    Partition I/O utilizationChecks whether the io_util of the cloud disk has reached 100%.Warning

    Instance status

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    Check ItemDescriptionRisk
    Level
    Solution
    Instance shutdownChecks whether the instance is shut down.WarningThe instance is shut down. Go to the CVM console to start it up.
    Instance restart historyChecks whether the instance has been restarted in the last 12 hours.WarningThe instance has been restarted in the last 12 hours. Pay attention to the instance running status.
    Instance kernel crashChecks whether a hung task has occurred in the instance in the last 12 hours.ExceptionA hung task, panic, or soft deadlock has occurred in the instance in the last 12 hours. Pay attention to the instance running status and troubleshoot as instructed in Kernel and I/O Issues.
    Checks whether a panic has occurred in the instance in the last 12 hours.Exception
    Checks whether a soft deadlock occurred in the instance in the last 12 hours.Exception

    Instance performance

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    Check ItemDescriptionRisk
    Level
    Solution
    CPU utilizationChecks whether the instance has experienced a high CPU utilization in the last 12 hours.WarningCheck your CPU utilization and adjust the configuration according. Troubleshoot it as instructed below:
    Memory utilizationChecks whether the instance has experienced a high memory utilization in the last 12 hours.Warning
    Basic CPU utilizationChecks whether the instance has experienced a high CPU utilization in the last 12 hours.Warning

    Instance network

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    Check ItemDescriptionRisk
    Level
    Solution
    Public EIP connectionChecks whether the EIP is isolated due to overdue payments.ExceptionAn EIP may be disconnected from the public network due to overdue payments. You need to go to the Billing Center to make the overdue payment.
    Existence of EIPChecks whether the instance has an EIP.WarningThe instance has no EIPs. If you want to use an EIP to access the public network, go to the EIP console to bind one.
    EIP blockedChecks whether the EIP is blocked due to DDoS attacksExceptionAn instance EIP is blocked due to DDoS attacks.
    Public network bandwidth utilizationChecks whether the instance has experienced a high public network inbound bandwidth utilization in the last 12 hours.WarningCheck the network usage and troubleshoot as instructed in Login Failure Due to High Bandwidth Utilization.
    Checks whether the instance has experienced a high public network outbound bandwidth utilization in the last 12 hours.Warning
    Private network bandwidth utilizationChecks whether the instance has experienced a high private network inbound bandwidth utilization in the last 12 hours.Warning
    Checks whether the instance has experienced a high private network outbound bandwidth utilization in the last 12 hours.Warning
    Packet lossChecks whether the instance has experienced TCP packet loss due to triggering of traffic throttling in the last 12 hours.WarningCheck the traffic to your application. For more information, see Network Packet Loss.
    Checks whether the instance has experienced UDP packet loss due to triggering of traffic throttling in the last 12 hours.Warning
    Checks whether the instance has experienced packet loss due to a soft interrupt in the last 12 hours.Warning
    Kernel network conditionsChecks whether the instance has experienced a full UDP send buffer in the last 12 hours.Warning
    Checks whether the instance has experienced a full UDP receive buffer in the last 12 hours.Warning
    Checks whether the instance has experienced a full TCP complete connection queue in the last 12 hours.Warning
    Checks whether the instance has experienced TCP request overflow in the last 12 hours.Warning
    Connection utilizationChecks whether the number of connections of the instance has reached the upper limit in the last 12 hours.Warning

    You can generate an instance detection result report or view historical reports as instructed in Checking Instance Status.

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