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Nginx 负载均衡状态介绍【down/backup/max_conns/max_fails/fail_timeout】

十年河东，十年河西，莫欺少年穷学无止境，精益求精 1、down 关键字用来标识某台服务器不参与负载均衡，该状态的使用场景是某台服务器需要停机维护时设置为down，或者发布新功能时 upstream backend { server 192.168.136.136; server 192.168.136.136:81 down; server 19

NetBackup Accelerator backup fails STATUS 84

NetBackup Accelerator backup fails STATUS 84 Article: 100049585 Last Published: 2021-03-11 Ratings: 3 0 Product(s): NetBackup Problem The NetBackup Accelerator feature enables the ability for repeated Full backups but with the performanc

从零开发短视频电商 Nginx负载均衡配置总结

负载均衡 nginx默认支持四种调度算法轮询(rr)-默认策略：每个请求按时间顺序逐一分配到不同的后端服务器，如果后端服务器故障，故障系统自动清除，使用户访问不受影响。轮询权值(weight)：weight值越大，分配到的访问几率越高，主要用于后端每个服务器性能不均的情况。ip_hash：每个请求按

踩坑日记（一）

团队博客: CSDN AI小组 2021/09/12，踩坑日记（一）：首先，我们来看一段代码： def request_create_commnuity(self, url, param): fails = 0 while True: try: if fails >= 20: break headers = {

报错：Cannot add or update a child row: a foreign key constraint fails

当使用外键而外键没有填入数据库就会报错解决方案：执行下面sql语句 SET FOREIGN_KEY_CHECKS=0; 解决完成后改回来 SET FOREIGN_KEY_CHECKS=1; 　　

on live upstreams while connecting to upstream

on live upstreams while connecting to upstream， nginx 由于网络突然卡顿之类，连接不上gateway(这里根本没压力)报 504 会在502，中间件有差不多11秒不能访问微服务所以要配置max_fails，一般设置3-5次重试，另外可以配置keepalive ，设置长连接来减少三次握手在 upstream 里面

pod install fails with “cannot load such file — xcodeproj”

I recently updated to ruby v 2.6 After upgrading I'm facing issue installing pods with the following error Traceback (most recent call last): 7: from /usr/local/bin/pod:23:in `<main>' 6: from /usr/local/bin/pod:23:in `load'

if this fails your Python may not be configured for Tk (CentOS 8 Python 3.9)

研究OPM-Flow，油藏相关数据解析，按教程https://opm-project.org/?page_id=197操作，在第6步时，提示没有tkinter，折腾了好久，记录下解决过程：环境： OPM在CentOS 8下运行 Python： 3.9.5自己编译的解决过程：安装python39-tkinter.x86_64，安装tk-devel，重修编译python，即可 # 1 yum search t

mysql删除表时报错：Cannot delete or update a parent row: a foreign key constraint fails 解决办法

参考StackOverflow：https://stackoverflow.com/questions/2300396/force-drop-mysql-bypassing-foreign-key-constraint?rq=1 原因：表之间存在外键约束，删除时会检查表之间的关联关系，导致删不掉解决办法： SET foreign_key_checks = 0; // 先设置外键约束检查关闭 drop table tab

ocjp 考试题之五

OCJP视频课堂，具体讲解：https://edu.csdn.net/course/detail/7811 QUESTION 102 Given:23. Object [] myObjects = {24. new Integer(12),25. new String("foo"),26. new Integer(5),27. new Boolean(true)28. };29. Arrays.sort(myObjects);30. for(int i=0;i<myObjects

外键添加失败：java.sql.SQLException: Cannot add or update a child row: a foreign key constraint fails

错误代码 java.sql.SQLException: Cannot add or update a child row: a foreign key constraint fails (book.t_order_item, CONSTRAINT t_order_item_ibfk_1 FOREIGN KEY (order_id) REFERENCES t_order (order_id)) Query: insert into t_order_item(name,count,price,total_p

nginx配置upstream并设置max_fails=1 fail_timeout=6000s后有几率出现502

具体报错信息如下： 2020/12/08 09:52:18 [error] 6#6: *832 no live upstreams while connecting to upstream, client: 10.78.104.169, server: 127.0.0.1, request: "POST /api/ppy-ls/login/check HTTP/1.1", upstream: "http://api//ppy-ls/login/check", hos

修改、删除表时候提示MySQL Cannot delete or update a parent row: a foreign key constraint fails

MySQL Cannot delete or update a parent row: a foreign key constraint fails 原因：外键关联一下代码查询外键： select TABLE_NAME,COLUMN_NAME,CONSTRAINT_NAME, REFERENCED_TABLE_NAME,REFERENCED_COLUMN_NAME from INFORMATION_SCHEMA.KEY_COLUMN_USAGE where CONSTRAINT_S

Failover/Reinstate within Dataguard configuration fails with ORA-16653 /ORA-16795 (Doc ID 1161094.1)

Oracle Database - Enterprise Edition - Version 10.1.0.2 to 12.1.0.2 [Release 10.1 to 12.1] PURPOSE Physical standby database is managed by the broker. After a successful failover with Dataguard Broker (dgmgrl) to a physical standby database "dgmg

【React Native错误集】Import fails with "Failed to execute 'ImportScripts' on 'Worker

　　错误1、Import fails with "Failed to execute 'ImportScripts' on 'WorkerGlobalScope'" 　　解决1、如果是在Degbug模式下，关闭turn off Debug JS Remotely。再重新运行即可。　　　　错误2：rn报错 unhandled JS Exception: Requiring unknown module "49". if yo

TSPITR fails With RMAN-06553 (Doc ID 2078790.1)

TSPITR fails With RMAN-06553 (Doc ID 2078790.1) APPLIES TO: Oracle Database - Enterprise Edition - Version 11.2.0.4 and laterOracle Database Cloud Schema Service - Version N/A and laterOracle Database Exadata Express Cloud Service - Version N/A and laterO

Windows 10 Shared folder - 5168: Spn check for SMB/SMB2 fails.

在搭建 Win10 Shared Folder 时，运行一段时间后就报 Access denied. 导致 Shared Folder 访问不了。查了下 Event Viewer -> Windows Logs -> Security, 报了 5168: Spn check for SMB/SMB2 fails 错误：解决方法： Start -> Local Security Policy -> Security Settings -> Loc

OData debug - Java client - why my batch request fails

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mysql添加外键后，报错:Cannot add or update a child row:a foreign key constraint fails

其实问题不大，主要就是自己不够细心。根据给出的错误提示，我仔细对比了一下主表和设有外键的表，发现设置的外键和对应的主键表的主键值不一致，重新修改后又报错了，原来是我主表的id字段类型是varchar，而我添加数据时添加的是int型数据，最后把把这个问题一改就不会报错了。

vMotion fails at 21% with error 195887371

虚机在Cluster内迁，统统失败在host上ping vmotion 地址可以ping通检查MTU get-cluster *** | get-vmhost | Get-VMHostNetworkAdapter -VMKernel | select VMhost, Name, IP, SubnetMask, PortGroupName, vMotionEnabled, mtu | where {$_.VMotionEnabled} | FT -AutoSize SubnetM

1452, 'Cannot add or update a child row: a foreign key constraint fails

(1452, 'Cannot add or update a child row: a foreign key constraint fails (`mxproject`.`django_admin_log`, CONSTRAINT `django_admin_log_user_id_c564eba6_fk_auth_user_id` FOREIGN KEY (`user_id`) REFERENCES `auth_user` (`id`))') 　　这时候需要在setting文件的

A. Ehab Fails to Be Thanos

链接：https://codeforces.com/contest/1174/problem/A 题意： You're given an array aa of length 2n2n. Is it possible to reorder it in such way so that the sum of the first nn elements isn't equal to the sum of the last nn elements? 思路：排序后求前一半和后一