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    Use Limits Overview

    Last updated: 2020-06-24 17:54:16

      Account limits for purchasing CVM instances

      • You need to sign up for a Tencent Cloud account. For more information on registration, see Sign Up for a Tencent Cloud Account.
      • You need to verify your identity. For more information, see Identity Verification Guide.
      • If you create a pay-as-you-go CVM, the system will freeze the cost of one-hour CVM usage. Make sure that your account has sufficient balance for the order.

      CVM instance use limits

      • Virtualized software cannot be installed or re-virtualized (such as installing VMware or Hyper-V).
      • You cannot use sound cards or mount external hardware devices (such as ISO files, USB flash drives, external disks, and U-keys).
      • The public gateway is available only in Linux operating system.

      CVM instance purchase limits

      • For each user, the quota of pay-as-you-go CVM instances in each availability zone is 30.
      • For more information, see CVM Instance Purchase Limits.

      Image Limits

      • Public images: no use limits.
      • Custom images: each region supports a maximum of 10 custom images.
      • Shared images: each custom image can be shared with a maximum of 50 Tencent Cloud users, and only be shared with accounts in the same region as the source account.
      • For more information, see Image Types Overview.

      EIP Limits

      Quota limits

      Resource Limit
      Number of EIPs for each Tencent Cloud account in each region 20
      Number of daily purchase applications for each Tencent Cloud account in each region Quota * 2
      Number of times that public IP addresses can be reassigned to each account for free per day when an EIP is unbound 10

      Limits on public IPs bound to a CVM

      Starting September 18, 2019, the maximum number of public IPs can be bound to a single CVM had changed based on CPU configuration. The quotas are as shown below:

      This limit does not apply to CVM instances purchased before 00:00, September 18, 2019. For these instances, the number of public IPs can be bound to each instance is equal to the number of private IPs supported by your server.

      Number of CPUs on a CVM Maximum number of public IPs can be bound (including public and elastic IPs)
      1–5 2
      6–11 3
      12–17 4
      18–23 5
      24–29 6
      30–35 7
      36–41 8
      42–47 9
      ≥ 48 10

      ENI Limits

      Based on CPU and memory configurations, the number of ENIs can be bound to a CVM differs from the number of private IPs can be bound to an ENI. The quotes are as shown below:

      The number of IP addresses bound to a single ENI indicates the maximum number allowed. The EIP quota is not provided based on this upper limit but based on EIP use limits.

      CVM configuration Number of ENIs Number of private IPs bound to a single ENI
      CPU: 1 core
      Memory: 1 GB      		 2 2
      CPU: 1 core
      Memory: > 1 GB      		 2 6
      CPU: 2 cores 2 10
      CPU: 4 cores
      Memory: < 16 GB      		 4 10
      CPU: 4 cores
      Memory: > 16 GB      		 4 20
      CPU: 8–12 cores 6 20
      CPU: > 12 cores 8 30

      Bandwidth Limits

      • Maximum outbound bandwidth (downstream bandwidth)

        • For CVMs created before 00:00, February 24, 2020, the following rules apply:

          Network Billing MethodInstanceMaximum Bandwidth Range (Mbps)
          Instance Billing MethodInstance Configuration
          Bill-by-trafficPay-as-you-go instancesAll0–100
          Bill-by-bandwidthPay-as-you-go instancesAll0–100
          Bandwidth packageAll0–2000

        • For CVMs created after 00:00, February 24, 2020, the following rules apply:

          Network Billing MethodInstanceMaximum Bandwidth Range (Mbps)
          Instance Billing MethodInstance Configuration
          Bill-by-trafficPay-as-you-go instancesAll0–100
          Bill-by-bandwidthPay-as-you-go instancesAll0–100
          Bandwidth packageAll0–2000

      • Maximum inbound bandwidth (upstream bandwidth)

        • If the fixed bandwidth you purchased is greater than 10 Mbps, Tencent Cloud will assign a public network inbound bandwidth equals to the purchased bandwidth.
        • If the fixed bandwidth you purchased is less than 10 Mbps, Tencent Cloud will assign 10-Mbps public network inbound bandwidth.

      Disk Limits

      Limit TypeDescription
      Elastic cloud disk capabilityStarting from May 2018, all data disks purchased with CVMs are elastic cloud disks, which can be unmounted from and remounted to CVMs. This feature is supported in all availability zones.
      Elastic cloud disk performanceI/O performance takes effect concurrently.
      For example, if a 1-TB SSD has a maximum random IOPS of 26,000, its IOPS for both reads and writes can reach this value. Due to performance limits, if the block size in this example is 4 KB or 8 KB, the maximum IOPS can be reached. If the block size is 16 KB, the maximum IOPS cannot be reached (throughput has already reached the limit of 260 MB/s.)
      Number of elastic cloud disks mounted to a CVMA maximum of 20
      Number of snapshots in one region64 + Number of cloud disks in the region x 64
      Cloud disks mounted to a CVMThe CVM and cloud disks must be in the same availability zone.
      Snapshot rollbackSnapshot data can only be rolled back to the cloud disk where the snapshot was created.
      Type of cloud disks can be created using snapshotsOnly snapshots of data disks can be used to create new elastic cloud disks.
      Size of cloud disks created using snapshotsThe size of cloud disks created using snapshots must be larger than or equal to that of the source cloud disk.

      Security Group Limits

      • Security groups are region-specific. A CVM can only be bound to security groups in the same region.
      • Security groups are applicable to CVM instances in any network environment.
      • Each user can configure a maximum of 50 security groups for each project in a region.
      • A maximum of 100 inbound or outbound rules can be configured for a security group.
      • One CVM can have multiple security groups, and one security group can be associated with multiple CVMs.
      • Security groups associated with CVMs on the basic network cannot filter packets from or to TencentDB and the elastic cache (Redis or Memcached). Instead, you can use iptables to filter traffic for such instances.
      • The quotas are as shown below:
        ItemLimit
        Number of security groups50 per region
        Number of rules in a security group100 for inbound rules and 100 for outbound rules
        Number of CVM instances associated with a security group2,000
        Number of security groups associated with a CVM instance5
        Number of rules in each security group that reference the security group ID10

      VPC Limits

      Resource Limit
      Number of VPC instances per region for each account 5
      Number of subnets per VPC 10
      Number of basic network CVMs can be associated with each VPC instance 100
      Number of route tables per VPC 10
      Number of route tables associated with each subnet 1
      Number of routing policies per route table 100
      Number of default HAVIPs per VPC 10

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