在使用apisix2.13.2的版本中，会出现上游错乱的问题。具体表现就是偶发的转发后服务地址无法访问，出现莫名其妙的错误，最后排查可能是上游之间串掉了，导致发错了地方，自然会报莫名其妙的错误。
解决方案
1.不使用apisix2.13.2版本。
2.在已使用的地方进行小版本升级，升级到apisix2.13.3版本。
升级方法参考
参考官网rpm安装方式，详见文末附带链接及内容
yum install -y --downloadonly --downloaddir=./apisix apisix-2.13.3
将apisix-2.13.3-0.el7.x86_64.rpm离线下载下来，然后在老版本所在服务器进行安装。（安装前先停止apisix）
apisix stop
yum install apisix-2.13.3-0.el7.x86_64.rpm
安装的时候会创建一个config-default.yaml.rpmnew的文件，保留老的config-default.yaml，由于小版本升级，所以也不用改动配置文件了。 安装完成后启动apisix进行测试
apisix start
再对服务进行大量的测试，我测试是问题已经解决。
参考资料
apisix rpm 安装
apisix.apache.org/docs/apisix…
If OpenResty is not installed, you can run the command below to install both OpenResty and APISIX repositories:
sudo yum install -y https://repos.apiseven.com/packages/centos/apache-apisix-repo-1.0-1.noarch.rpm
Copy
If OpenResty is installed, the command below will install the APISIX repositories:
sudo yum-config-manager --add-repo https://repos.apiseven.com/packages/centos/apache-apisix.repo
Copy
Then, to install APISIX, run:
sudo yum install apisix
TIP
You can also install a specific version of APISIX by specifying it:
sudo yum install apisix-2.13.1
apisix 2.13.2升级到2.13.3记录
yum install apisix-2.13.3-0.el7.x86_64.rp m
Loaded plugins: fastestmirror
Examining apisix-2.13.3-0.el7.x86_64.rpm: apisix-2.13.3-0.el7.x86_64
Marking apisix-2.13.3-0.el7.x86_64.rpm as an update to apisix-2.13.2-0.el7.x86_6 4
Resolving Dependencies
--> Running transaction check
---> Package apisix.x86_64 0:2.13.2-0.el7 will be updated
---> Package apisix.x86_64 0:2.13.3-0.el7 will be an update
--> Finished Dependency Resolution
Dependencies Resolved
================================================================================
Package Arch Version Repository Size
================================================================================
Updating:
apisix x86_64 2.13.3-0.el7 /apisix-2.13.3-0.el7.x86_64 9.4 M
Transaction Summary
================================================================================
Upgrade 1 Package
Total size: 9.4 M
Is this ok [y/d/N]: y
Downloading packages:
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
Updating : apisix-2.13.3-0.el7.x86_64 1/2
warning: /usr/local/apisix/conf/config-default.yaml created as /usr/local/apisix /conf/config-default.yaml.rpmnew
Cleanup : apisix-2.13.2-0.el7.x86_64 2/2
Verifying : apisix-2.13.3-0.el7.x86_64 1/2
Verifying : apisix-2.13.2-0.el7.x86_64 2/2
Updated:
apisix.x86_64 0:2.13.3-0.el7
Complete!
