consul安装部署

1.集群规划

IP	类型	机房	说明
10.242.178.130	consul server	新港	Consul v1.10.2
10.242.178.131	consul server	新港	Consul v1.10.2
10.242.178.129	consul server	新港	Consul v1.10.2
10.243.204.103	consul client	新港	Consul v1.10.2

2.安装部署

2.1.文件系统规划

consul server

lvcreate -n consullv datavg -L 1G
mkdir /consul
mkfs.ext3 /dev/datavg/consullv 
echo "/dev/datavg/consullv /consul ext3 defaults,noatime,nodiratime 0 0" >>/etc/fstab
mount -a
mkdir /consul/data
mkdir /consul/etc
mkdir /consul/bin
mkdir /consul/log

consul client

mkdir -p /opt/consul/data
mkdir -p /opt/consul/etc
mkdir -p /opt/consul/bin
mkdir -p /opt/consul/log

2.2.软件部署

将consul直接复制至/consul/bin(server)和/opt/consul/bin(client)下即可

rsync -e "sudo ssh" consul 10.242.178.130:/consul/bin/
rsync -e "sudo ssh" consul 10.242.178.131:/consul/bin/
rsync -e "sudo ssh" consul 10.242.178.129:/consul/bin/
rsync -e "sudo ssh" consul 10.243.204.103:/opt/consul/bin/

2.3.配置文件

server 10.242.178.130 /consul/etc/server.json 首次启动需注册tokens.default并bootstrap_expect设置为1

{
"data_dir": "/consul/data",
"datacenter": "xingang",
"primary_datacenter":"xingang",
"log_level": "INFO",
"server": true,
"bootstrap_expect": 3,
"bind_addr": "10.242.178.130",
"client_addr": "0.0.0.0",
"recursors":["10.237.255.253"],
"start_join": ["10.242.178.129","10.242.178.130","10.242.178.131"],
"retry_join": ["10.242.178.129","10.242.178.130","10.242.178.131"],
"node_name": "dnsservernode1",
"encrypt": "PwGyXsuuc6w0Jx6noxi6PwrN6GeH1HHYBpZ4E77mEwk=",
"log_file":"/consul/log/",
"log_rotate_duration":"24h",
"log_rotate_bytes":10000000,
"log_rotate_max_files":100,
"domain": "sndb",
"ports": {"dns": 53},
"acl": {"enabled": true,          "default_policy": "deny","enable_token_persistence":true,"tokens":{"master":"a5f21285-42de-f589-eded-ffc5443bca00","default":"7a8ea281-c9a2-b559-e3df-578d46752f70"}},
"ui_config": {"enabled": true}
}

server 10.242.178.131 /consul/etc/server.json

{
"data_dir": "/consul/data",
"datacenter": "xingang",
"primary_datacenter":"xingang",
"log_level": "INFO",
"server": true,
"bootstrap_expect": 3,
"bind_addr": "10.242.178.131",
"client_addr": "0.0.0.0",
"recursors":["10.237.255.253"],
"start_join": ["10.242.178.129","10.242.178.130","10.242.178.131"],
"retry_join": ["10.242.178.129","10.242.178.130","10.242.178.131"],
"node_name": "dnsservernode2",
"encrypt": "PwGyXsuuc6w0Jx6noxi6PwrN6GeH1HHYBpZ4E77mEwk=",
"log_file":"/consul/log/",
"log_rotate_duration":"24h",
"log_rotate_bytes":10000000,
"log_rotate_max_files":100,
"domain": "sndb",
"ports": {"dns": 53},
"acl": {"enabled": true,          "default_policy": "deny","enable_token_persistence":true,"tokens":{"master":"a5f21285-42de-f589-eded-ffc5443bca00","default":"7a8ea281-c9a2-b559-e3df-578d46752f70"}},
"ui_config": {"enabled": true}
}

server 10.242.178.129 /consul/etc/server.json

{
"data_dir": "/consul/data",
"datacenter": "xingang",
"primary_datacenter":"xingang",
"log_level": "INFO",
"server": true,
"bootstrap_expect": 3,
"bind_addr": "10.242.178.129",
"client_addr": "0.0.0.0",
"recursors":["10.237.255.253"],
"start_join": ["10.242.178.129","10.242.178.130","10.242.178.131"],
"retry_join": ["10.242.178.129","10.242.178.130","10.242.178.131"],
"node_name": "dnsservernode3",
"encrypt": "PwGyXsuuc6w0Jx6noxi6PwrN6GeH1HHYBpZ4E77mEwk=",
"log_file":"/consul/log/",
"log_rotate_duration":"24h",
"log_rotate_bytes":10000000,
"log_rotate_max_files":100,
"domain": "sndb",
"ports": {"dns": 53},
"acl": {"enabled": true,          "default_policy": "deny","enable_token_persistence":true,"tokens":{"master":"a5f21285-42de-f589-eded-ffc5443bca00","default":"7a8ea281-c9a2-b559-e3df-578d46752f70"}},
"ui_config": {"enabled": true}
}

client 10.243.204.103 /opt/consul/etc/client.json

{
"data_dir": "/opt/consul/data",
"enable_script_checks": true,
"bind_addr": "10.243.204.103",
"client_addr": "0.0.0.0",
"retry_join": ["10.242.178.129","10.242.178.130","10.242.178.131"],
"retry_interval": "5s",
"rejoin_after_leave": true,
"start_join": ["10.242.178.129","10.242.178.130","10.242.178.131"],
"node_name": "10.243.204.103",
"datacenter": "xingang",
"primary_datacenter":"xingang",
"encrypt": "PwGyXsuuc6w0Jx6noxi6PwrN6GeH1HHYBpZ4E77mEwk=",
"log_file":"/opt/consul/log/",
"log_rotate_duration":"24h",
"log_rotate_bytes":10000000,
"log_rotate_max_files":100,
"encrypt_verify_incoming": true,
"encrypt_verify_outgoing": true,
"enable_local_script_checks":true,
"acl":{
"tokens": {"default":"7a8ea281-c9a2-b559-e3df-578d46752f70"}
}
}

2.5.启动集群

server

cd /consul
nohup  bin/consul agent -config-dir=etc/ &

client

cd /opt/consul
nohup  bin/consul agent -config-dir=etc/ &

2.6.状态检查

[root@lobapredb128 consul]# export CONSUL_HTTP_TOKEN=a5f21285-42de-f589-eded-ffc5443bca00
[root@lobapredb128 consul]# bin/consul operator raft list-peers
Node            ID                                 Address              State     Voter  RaftProtocol
dnsservernode1  c30c7352-ca26-938d-9527-cb934802a94c  10.242.178.130:8300  leader    true   3
dnsservernode2  0aff7e86-6ef3-63e9-6198-41046206b371  10.242.178.131:8300  follower  true   3
dnsservernode3  f5ff7588-6737-de5a-4f06-eb2bcbb691a4  10.242.178.129:8300  follower  true   3
[root@lobapredb128 consul]# bin/consul members
Node            Address              Status  Type    Build   Protocol  DC       Segment
dnsservernode1  10.242.178.130:8301  alive   server  1.10.2  2         xingang  <all>
dnsservernode2  10.242.178.131:8301  alive   server  1.10.2  2         xingang  <all>
dnsservernode3  10.242.178.129:8301  alive   server  1.10.2  2         xingang  <all>
10.243.204.103  10.243.204.103:8301  alive   client  1.10.2  2         xingang  <default>

2.7.域名测试

[root@lobapredb128 ~]# dig consul.service.sndb @10.242.178.131


consul.service.sndb.    0   IN  A   10.242.178.131
consul.service.sndb.    0   IN  A   10.242.178.129
consul.service.sndb.    0   IN  A   10.242.178.130

[root@lobapredb128 ~]# dig consul.service.sndb @10.242.178.130

consul.service.sndb.    0   IN  A   10.242.178.131
consul.service.sndb.    0   IN  A   10.242.178.129
consul.service.sndb.    0   IN  A   10.242.178.130


[root@lobapredb128 ~]# dig consul.service.sndb @10.242.178.129

consul.service.sndb.    0   IN  A   10.242.178.131
consul.service.sndb.    0   IN  A   10.242.178.130
consul.service.sndb.    0   IN  A   10.242.178.129

3.服务注册

3.1.配置文件

client 10.243.204.103 /opt/consul/etc/service.json

{
"services": [{"name": "mysqlro","id": "10.243.204.103_ro","address": "10.243.204.103","port": 3306, "check": { "id":"10.243.204.103_ro_ck","name":"check 3306","tcp": "10.243.204.103:3306","interval": "5s","timeout": "1s"}   }
]
}

3.2.生效配置

client 10.243.204.103

[root@lobapredb162 ~]# /opt/consul/bin/consul reload
Configuration reload triggered

3.3.域名测试

client 10.243.204.103

[root@lobapredb162 ~]# dig mysqlro.service.sndb @10.242.178.131 

mysqlro.service.sndb.   0   IN  A   10.243.204.103


[root@lobapredb162 ~]# dig mysqlro.service.sndb @10.242.178.130

mysqlro.service.sndb.   0   IN  A   10.243.204.103


[root@lobapredb162 ~]# dig mysqlro.service.sndb @10.242.178.129

mysqlro.service.sndb.   0   IN  A   10.243.204.103

4.集群高可用测试

4.1.leader节点宕机

10.242.178.130

kill server端consul进程

[root@lobapredb128 consul]# bin/consul operator raft list-peers
Node            ID                                 Address              State     Voter  RaftProtocol
dnsservernode1  c30c7352-ca26-938d-9527-cb934802a94c  10.242.178.130:8300  leader    true   3
dnsservernode2  0aff7e86-6ef3-63e9-6198-41046206b371  10.242.178.131:8300  follower  true   3
dnsservernode3  f5ff7588-6737-de5a-4f06-eb2bcbb691a4  10.242.178.129:8300  follower  true   3
[root@lobapredb128 consul]# ps -ef|grep -i consul
root     15902     1  1 11:57 ?        00:03:49 bin/consul agent -config-dir=etc/
root     20595 20016  0 16:25 pts/0    00:00:00 grep -i consul
[root@lobapredb128 consul]# kill -9 15902
[root@lobapredb128 consul]# bin/consul operator raft list-peers
Error getting peers: Failed to retrieve raft configuration: Get "http://127.0.0.1:8500/v1/operator/raft/configuration": dial tcp 127.0.0.1:8500: connect: connection refused

10.242.178.129 leader宕机后10s切换为新leader

重新选举后测试域名consul.service.sndb和mysqlro.service.sndb

[root@lobapredb127 consul]#  export CONSUL_HTTP_TOKEN=a5f21285-42de-f589-eded-ffc5443bca00
[root@lobapredb127 consul]# bin/consul operator raft list-peers
Node            ID                                 Address              State     Voter  RaftProtocol
dnsservernode2  0aff7e86-6ef3-63e9-6198-41046206b371  10.242.178.131:8300  follower  true   3
dnsservernode3  f5ff7588-6737-de5a-4f06-eb2bcbb691a4  10.242.178.129:8300  leader    true   3
[root@lobapredb126 ~]# dig consul.service.sndb @10.242.178.129

consul.service.sndb.    0   IN  A   10.242.178.131
consul.service.sndb.    0   IN  A   10.242.178.129


[root@lobapredb126 ~]# dig consul.service.sndb @10.242.178.131

consul.service.sndb.    0   IN  A   10.242.178.131
consul.service.sndb.    0   IN  A   10.242.178.129


[root@lobapredb126 ~]# dig mysqlro.service.sndb @10.242.178.131

mysqlro.service.sndb.   0   IN  A   10.243.204.103


[root@lobapredb126 ~]# dig mysqlro.service.sndb @10.242.178.129


mysqlro.service.sndb.   0   IN  A   10.243.204.103

10.242.178.130

恢复原leader节点后进行域名测试

[root@lobapredb128 consul]# bin/consul operator raft list-peers
Node            ID                                    Address              State     Voter  RaftProtocol
dnsservernode2  0aff7e86-6ef3-63e9-6198-41046206b371  10.242.178.131:8300  follower  true   3
dnsservernode3  f5ff7588-6737-de5a-4f06-eb2bcbb691a4  10.242.178.129:8300  leader    true   3
dnsservernode1  c30c7352-ca26-938d-9527-cb934802a94c  10.242.178.130:8300  follower  true   3
[root@lobapredb128 consul]# dig consul.service.sndb @10.242.178.130

consul.service.sndb.    0   IN  A   10.242.178.130
consul.service.sndb.    0   IN  A   10.242.178.129
consul.service.sndb.    0   IN  A   10.242.178.131

[root@lobapredb128 consul]# dig mysqlro.service.sndb @10.242.178.130

mysqlro.service.sndb.   0   IN  A   10.243.204.103

4.2.follower节点宕机

10.242.178.131

[root@lobapredb127 consul]# ps -ef|grep -i consul
root      4316     1  1 17:34 pts/0    00:00:02 bin/consul agent -config-dir=etc/
root      5148  3923  0 17:37 pts/0    00:00:00 grep -i consul
[root@lobapredb127 consul]# kill -9 4316

10.242.178.130

[root@lobapredb128 consul]# bin/consul operator raft list-peers
Node            ID                                    Address              State     Voter  RaftProtocol
dnsservernode3  f5ff7588-6737-de5a-4f06-eb2bcbb691a4  10.242.178.129:8300  follower  true   3
dnsservernode1  c30c7352-ca26-938d-9527-cb934802a94c  10.242.178.130:8300  leader    true   3
[root@lobapredb128 consul]# dig consul.service.sndb @10.242.178.129

consul.service.sndb.    0   IN  A   10.242.178.130
consul.service.sndb.    0   IN  A   10.242.178.129


[root@lobapredb128 consul]# dig consul.service.sndb @10.242.178.130

consul.service.sndb.    0   IN  A   10.242.178.130
consul.service.sndb.    0   IN  A   10.242.178.129

[root@lobapredb128 consul]# dig mysqlro.service.sndb @10.242.178.129

mysqlro.service.sndb.   0   IN  A   10.243.204.103


[root@lobapredb128 consul]# dig mysqlro.service.sndb @10.242.178.130

mysqlro.service.sndb.   0   IN  A   10.243.204.103

4.3.超半数节点宕机

集群当前状态

[root@lobapredb128 consul]# bin/consul operator raft list-peers
Node            ID                                 Address              State     Voter  RaftProtocol
dnsservernode3  f5ff7588-6737-de5a-4f06-eb2bcbb691a4  10.242.178.129:8300  follower  true   3
dnsservernode1  c30c7352-ca26-938d-9527-cb934802a94c  10.242.178.130:8300  leader    true   3
dnsservernode2  0aff7e86-6ef3-63e9-6198-41046206b371  10.242.178.131:8300  follower  true   3

停止两台follower节点后集群状态,集群无法完成选举

[root@lobapredb128 consul]# bin/consul operator raft list-peers
Error getting peers: Failed to retrieve raft configuration: Unexpected response code: 500 (No cluster leader)
[root@lobapredb128 consul]# bin/consul members
Node            Address              Status  Type    Build   Protocol  DC       Segment
dnsservernode1  10.242.178.130:8301  alive   server  1.10.2  2         xingang  <all>
dnsservernode2  10.242.178.131:8301  left    server  1.10.2  2         xingang  <all>
dnsservernode3  10.242.178.129:8301  failed  server  1.10.2  2         xingang  <all>
10.243.204.103  10.243.204.103:8301  alive   client  1.10.2  2         xingang  <default>

域名测试,域名解析正常，但因无leader节点，集群服务注册/探测等功能失效，生效域名为集群失效前状态

[root@lobapredb128 consul]# dig consul.service.sndb @10.242.178.130

consul.service.sndb.    0   IN  A   10.242.178.130
consul.service.sndb.    0   IN  A   10.242.178.129


[root@lobapredb128 consul]# dig mysqlro.service.sndb @10.242.178.130

mysqlro.service.sndb.   0   IN  A   10.243.204.103

4.4.高可用测试总结

3节点集群下高可用测试

测试场景	DNS解析	服务注册	服务探测	说明
leader节点宕机	正常	正常	正常	选举期间服务注册和探测不可用,DNS解析正常,选举时间13s
follower节点宕机	正常	正常	正常	单台follower节点宕机无影响
超半数节点宕机	正常	不可用	不可用	服务状态为集群状态正常情况下最终状态

5.访问控制

5.1.policy

初始策略,所有node和service均可向server注册

node_prefix "" {policy="write"}
service_prefix "" {policy="write"}

5.2.token

client使用基于policy生成的token与server端通信:7a8ea281-c9a2-b559-e3df-578d46752f70

{
"data_dir": "/opt/consul/data",
"enable_script_checks": true,
"bind_addr": "10.243.204.103",
"client_addr": "0.0.0.0",
"retry_join": ["10.242.178.129","10.242.178.130","10.242.178.131"],
"retry_interval": "5s",
"rejoin_after_leave": true,
"start_join": ["10.242.178.129","10.242.178.130","10.242.178.131"],
"node_name": "10.243.204.103",
"datacenter": "xingang",
"primary_datacenter":"xingang",
"encrypt": "PwGyXsuuc6w0Jx6noxi6PwrN6GeH1HHYBpZ4E77mEwk=",
"log_file":"/opt/consul/log/",
"log_rotate_duration":"24h",
"log_rotate_bytes":10000000,
"log_rotate_max_files":100,
"encrypt_verify_incoming": true,
"encrypt_verify_outgoing": true,
"enable_local_script_checks":true,
"acl":{
"tokens": {"default":"7a8ea281-c9a2-b559-e3df-578d46752f70"}
}
}

5.3.隔离节点

集群状态及域名探测

[root@lobapredb128 consul]# dig mysqlro.service.sndbxingang @10.242.178.130

mysqlro.service.sndbxingang. 0  IN  A   10.243.204.103
mysqlro.service.sndbxingang. 0  IN  A   10.243.204.104
[root@lobapredb128 consul]# bin/consul members
Node            Address              Status  Type    Build   Protocol  DC       Segment
dnsservernode1  10.242.178.130:8301  alive   server  1.10.2  2         xingang  <all>
dnsservernode2  10.242.178.131:8301  alive   server  1.10.2  2         xingang  <all>
dnsservernode3  10.242.178.129:8301  alive   server  1.10.2  2         xingang  <all>
10.243.204.103  10.243.204.103:8301  alive   client  1.10.2  2         xingang  <default>
10.243.204.104  10.243.204.104:8301  alive   client  1.10.2  2         xingang  <default>

更新policy

[root@lobapredb128 consul]# export CONSUL_HTTP_TOKEN=a5f21285-42de-f589-eded-ffc5443bca00
[root@lobapredb128 consul]# bin/consul acl policy read -name client -meta
ID:           ab253c6d-7b8e-37f5-ac98-5be3ad7dd797
Name:         client
Description:  
Datacenters:  
Hash:         7bcf1a65681e133eb14e11d05ec5658ffd24281f305f7bea0709dd98b5b784ab
Create Index: 11
Modify Index: 23246
Rules:
node_prefix "" {  policy="write"  }service_prefix "" {  policy="write"  }
[root@lobapredb128 consul]# bin/consul acl policy update -name client -rules 'node "10.243.204.103"{policy="deny"}node_prefix "" {  policy="write"  }service_prefix "" {  policy="write"  }'
ID:           ab253c6d-7b8e-37f5-ac98-5be3ad7dd797
Name:         client
Description:  
Datacenters:  
Rules:
node "10.243.204.103"{policy="deny"}node_prefix "" {  policy="write"  }service_prefix "" {  policy="write"  }
[root@lobapredb128 consul]# dig mysqlro.service.sndbxingang @10.242.178.130

mysqlro.service.sndbxingang. 0  IN  A   10.243.204.104

5.4.解除隔离

[root@lobapredb128 consul]# bin/consul acl policy update -name client -rules 'node_prefix "" {  policy="write"  }service_prefix "" {  policy="write"  }'
ID:           ab253c6d-7b8e-37f5-ac98-5be3ad7dd797
Name:         client
Description:  
Datacenters:  
Rules:
node_prefix "" {  policy="write"  }service_prefix "" {  policy="write"  }
[root@lobapredb128 consul]# dig mysqlro.service.sndbxingang @10.242.178.130

mysqlro.service.sndbxingang. 0  IN  A   10.243.204.103
mysqlro.service.sndbxingang. 0  IN  A   10.243.204.104

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JavaScript中for、for...in、for...of、forEach的区别和用法for循环forEach循环for...in循环for...of循环总结for循环基本语法格式： for(初始化变量;条件表达式;操作表达式){循环体语句;}普通for循环在Array和Object中都可以使用。for循环中可以使用return、break…...
2024/5/7 19:32:20
阿巴阿巴。
#define _CRT_SECURE_NO_WARNINGS #include<iostream> #include<string> #include<algorithm> using namespace std;struct acm {int a;//队伍名int b;//通过题数int c;//罚时int d[12];//通过的题号}ss[1010];int main() {int n, m;cin >> n >>…...
2024/5/2 4:08:07
C++ 09 翁恺＞初始化列表
说明：初始化列表里能初始化任何数据类型的数据，它和Point(float a, int b) { ...初始化... }，与写在大括号里赋值这种是有差别的，初始化例表里对数据的初始化是在构造函数之前进行的，建议类里面的所有成员变量到要在…...
2024/4/15 12:43:58
pc vue组件传值，父子传值
//父级页面 <Agree :isShow"dialogVisible" checkKey"getCheckBoxType"</Agree> //父级函数部分 //默认弹窗展示，选中都为falae import Agree from ./component/agreement.vue const dialogVisible ref(false) // 协议选中字段 const…...
2024/4/29 16:20:14
Java入门案例GUI-图书馆访问者统计器
本案例中的程序将展示2004年至2016的某省图书馆访客的统计数据。当单击“显示统计数据”按钮时，程序将以表格和图形的形式显示这些数据。以下是2004-2016年图书馆参观人数统计，如图6-3-4所示。图6-3-4 图书馆参观人数统计以下是创建程序的步骤。 ① 使…...
2024/5/7 14:47:47
.equals
“”比较两个变量本身的值，即两个对象在内存中的首地址。 “equals()”比较字符串中所包含的内容是否相同。 s1“abc”,s2“abc” s1.equals(s2); //得到ture...
2024/5/1 0:39:17
LambdaQueryWrapper构建查询条件、模糊查询、范围查询、排序
#代码如下 public Page<PddMerchants> shopList(MerchantRequest info) {LambdaQueryWrapper<Merchant> queryWrapper new LambdaQueryWrapper<>();// 模糊搜索条件if (StringUtils.notEmpty(info.getKeyword())) {queryWrapper.and(c -> c.like(Mercha…...
2024/5/7 4:11:14
国产化DM达梦数据库 - 用户状态查询、锁定与解锁，“登录失败次数超过限制”问题解决
达梦数据库密码输入错误达到限制后会被锁定一段时间。 An error occurred while establishing the connection:Long Message: 登录失败次数超过限制Details:Type: java.sql.SQLExceptionError Code: -2508SQL State: 22001可以用下面的方法查看失败限制次数、失败尝试次数和锁…...
2024/4/24 18:52:35
layui官网关闭，爬下来的备用开发文档地址
废话不多说，直接上网站 https://www.python87.com/layui/index.htm...
2024/5/7 23:24:46
测试必会：BUG的分类及推进解决
有一些初始的小测试团队，对BUG单可能会进行重要程度的划分，但并不会进行类型划分。其实，如果不对BUG进行错误类型定义，项目经理或测试经理并不好确认后续质量提升在哪方面进行改进，具体研发的哪个环节更需要进行改进…...
2024/4/22 14:33:13
rem适配插件
一、使用 lib-flexible 动态设置 REM 基准值（html 标签的字体大小） 1、安装 npm i amfe-flexible 2、然后在 main.js 中加载执行该模块 import amfe-flexible...
2024/5/7 10:54:41
FPGA数码管显示自动计数+按键计数+蜂鸣器
top顶层文件 module seg_test(input clk,input rst_n,input key1,input key2,output buzzer,output [5:0] seg_sel,output [7:0] seg_data ); wire button_negedge; ax_debounce ax_debounce_m0 (.clk (clk),.rst (~rst_…...
2024/5/7 21:52:08
e.printStackTrace
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2024/5/5 1:28:14
LVIS Challenge 2021长尾分布实例分割冠军解决方案
本文介绍我们在ICCV 2021 LVIS Challenge Workshop上的冠军解决方案。 1. LVIS 2021竞赛简介 1.1 数据集 Large Vocabulary Instance Segmentation (LVIS)是一个实例分割的基准数据集。该数据集包含超过1000个类别和大约200万个高质量的mask标注。由于数据集中包含自然图像…...
2024/5/6 3:19:04
国产化DM达梦数据库：用户状态查询、锁定与解锁，“登录失败次数超过限制”问题解决
达梦数据库密码输入错误达到限制后会被锁定一段时间。 An error occurred while establishing the connection:Long Message: 登录失败次数超过限制Details:Type: java.sql.SQLExceptionError Code: -2508SQL State: 22001可以用下面的方法查看失败限制次数、失败尝试次数和锁…...
2024/5/6 17:28:53
Linux命令：du
查看内存空间占用 du -sh //总和 du -sh * //每一个文件或目录的大小...
2024/5/7 9:53:21
个人项目祝泰萍
项目内容所属课程软件工程作业简介使用源码管理工具对猜数字小游戏开发进行源码管理作业目的熟悉Git、码云的基本使用方法以及回顾Java的基本语法学生姓名祝泰萍代码仓库https://gitee.com/zhu-tp/zhu-tai-ping.git...
2024/5/7 23:40:11
关于语言模型中的平滑
在语言模型计算概率的时候，我们会碰到概率为0的情况，即计算的单词在语言模型中并没有出现过。这个时候会使用平滑的方法计算概率，一般分为以下几种： Add-One Smoothing Add-K Smoothing 其中Add-One Smoothing可以看作Add-K Sm…...
2024/5/5 23:49:23
记一次xxl-job 因sql连接时区问题的坑
问题描述： 部署环境后 xxl-job-admin 启动 job服务启动并注册到xxl-job-admin 此时xxl-job-admin数据库连接配置时一定要用相同的时区，比如&serverTimezoneAsia/Shanghai 否则造成的注册是写入数据库的时间和xxl-job-admin 心跳检测机制失败&am…...
2024/4/16 17:16:16
SQL常见查询写法
SQL常见写法查询简单查询简单过滤重复（DISTINCT ）简单联表查询（Join）不使用 Join 关键字Join关键字分页查询BETWEEN ANDTop用法SQL Server 2012的OFFSET-FETCH筛选查询简单查询 //field 字段//Table 表SELECT field FROM Ta…...
2024/4/17 2:40:49