CLB unable to access / access timeout troubleshooting

visit CLB Overtime , There may be many reasons , The following troubleshooting methods can help you quickly locate the cause of the problem .

• Determine whether the network connectivity and security rules are released
  • ping vip If there is something wrong , Whether there is packet loss
  • clb Security group 、rs Security group 、acl、os Inside iptables Wait for release
  • clb Whether the bandwidth reaches the bottleneck ( Standard accounts only , The bandwidth of traditional accounts is RS Upper management )
• Confirm that the business side is normal
  • Bypass LB Direct access RS If there is something wrong
    • If RS Intranet only IP, You can use the same VPC Access to other machines in the , If you want to carry the domain name to access , Internal modification of the machine hosts File or curl carry host Header access ：

      echo x.x.x.x domain.com >> /etc/hosts        # By writing hosts visit 
      curl -I -H 'Host: domain.com' http://x.x.x.x   # adopt curl Carry head access 
      curl -Ik -H 'Host: domain.com' https://x.x.x.x  # about https add -k Parameter ignore validation 

• Grab the bag
  • Temporary RS binding EIP If there is no problem in the above troubleshooting, the full link packet capturing is required to confirm the timeout reason , You can ask the Engineer for help .
  • At the same time, a relatively complete troubleshooting process is sorted out for reference

PDF edition ：

request CLB Overtime .pdf