grant all privileges on zabbix.* to zabbix@localhost identified by 'password'; flush privileges;
vi /etc/httpd/conf.d/zabbix.conf, php_value date.timezone Asia/Shanghai
SET AUTOCOMMIT=0; // AUTOCOMMIT=1;提交指令：
COMMIT;
//列出系統上最耗費記憶體的程式
//-e 輸出所有行程的資訊
//-o 指定輸出欄位
//--sort 排序
ps -eo pid,ppid,cmd,%mem,%cpu --sort=-%mem | head
//取當前pid
echo $$
//process 資源限制
ls /proc/{pid}/fd
cat /proc/{pid}/limits
//開檔狀況
ls -l /proc/{pid}/fd | less
//總開檔數
ls -l /proc/{pid}/fd | wc -l
//查看80是哪個procese監聽的 netstat -tlnp | grep :22 tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN 1444/sshd tcp6 0 0 :::22 :::* LISTEN 1444/sshd
sudo -i 切換為root
//scp scp "fileName" ubuntu@xxx.xx.xx.xx:/home/ubuntu/ scp -i "keyfile" filename aa@xxx.xxx.xxx.xxx:/home/aa/ sshpass -p "pass" scp "fileName" ubuntu@xxx.xx.xx.xx:/home/ubuntu/ //指定port P大寫 scp -P port root@xxx.xxx.xxx:/root/abc.jpg abc.jpc scp -P port abc.jpg root@xxx.xxx.xxx:/root/abc.jpg //指定key ssh -i 'keyfile' aa@xxx.xxx.xxx.xxx //設定ssh timeout 時間 vim /etc/ssh/sshd_config //找到ClientAliveInterval 参数，如果没有就自己加一行。 //client alive 檢查，秒 ClientAliveInterval=600 //client alive 檢查次數 ClientAliveCountMax=12 //依據以上設定，就是600*12=7200秒都沒反應就斷線 //開啟root ssh login sudo passwd root //更改root密碼 sudo vi /etc/ssh/sshd_config PermitRootLogin yes PasswordAuthentication yes //centos service sshd restart systemctl restart sshd //debain service ssh restart systemctl restart sshd
1. Start ssh-agent in the background. > Agent pid xxxxx 2. Add ssh key to agent $ ssh-add -K pathToPrivateKey (-K 只限mac 內建的ssh-add, 表示存 passphase in your keychain) 3. if you key with passphase, agent will ask you to input pass. //看ssh-agent執行狀況 看變數，是否有輸出 echo $SSH_AUTH_SOCK echo $SSH_AGENT_PID //in shell script //自動加入所有預設rsa的key if [ -z "$SSH_AUTH_SOCK" ] ; then eval `ssh-agent -K` ssh-add fi //kill ssh-agent ssh-agent -k
Host 連線至遠端的別稱(可以隨便填) HostName 遠端的Domain或IP Port 遠端的SSH連接埠(為預設的話可以不填) User 使用者名稱 PreferredAuthentications 偏好使用的驗證(這邊的值都為publickey) IdentityFile 私鑰的位置(可為相對或絕對位置，但建議使用絕對位置) //edit ~/.ssh/config Host gh.aaa.my HostName github.com User Hi_AAA PreferredAuthentications publickey IdentityFile ~/.ssh/id_rsa_aaa_github Host gh.bbb.company HostName github.com User Hi_BBB PreferredAuthentications publickey IdentityFile ~/.ssh/id_rsa_bbb_github Host bb.aaa.my HostName bitbucket.org User Yo_AAA PreferredAuthentications publickey IdentityFile ~/.ssh/id_rsa_aaa_bitbucket 原本 repo 位置會改變 原本 git@github.com:Hi_AAA/my_project.git 新的 git@gh.aaa.my:Hi_AAA/my_project.git Domain的部分可以使用設定檔的 Host 名稱取代 //key 加入 ssh-agent 管理 ssh-add
apt-cache policy mysql-server 列出mysql所有版本 apt-get install mysql-server=5.6.29 安裝mysql指定版本
POST /?id=1 HTTP/1.1 (Start-line=>request line)
Host: echo.paw.cloud (header-field)
Content-Type: application/json; charset=utf-8 (header-field)
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.12; rv:53.0) Gecko/20100101 Firefox/53.0 (header-field)
Connection: close (header-field)
Content-Length: 136 (header-field)
(CRLF)
(以下為message-body)
{
"status": "ok",
"extended": true,
"results": [
{"value": 0, "type": "int64"},
{"value": 1.0e+3, "type": "decimal"}
]
}
HTTP/1.1 200 OK (Start-line=>status line) Content-Type: text/html; charset=utf-8 (header-field) Date: Sat, 18 Feb 2017 00:01:57 GMT (header-field) Server: nginx/1.11.8 (header-field) transfer-encoding: chunked (header-field) Connection: Close (header-field) (CRLF) (以下為message-body) <html lang="en"> <head> <title>echo<title> </head>
GET 请求指定的页面信息，并返回实体主体。
HEAD 类似于get请求，只不过返回的响应中没有具体的内容，用于获取报头
POST 向指定资源提交数据进行处理请求（例如提交表单或者上传文件）。数据被包含在请求体中。POST请求可能会导致新的资源的建立和/或已有资源的修改。
PUT 从客户端向服务器传送的数据取代指定的文档的内容。
DELETE 请求服务器删除指定的页面。
CONNECT HTTP/1.1协议中预留给能够将连接改为管道方式的代理服务器。
OPTIONS 允许客户端查看服务器的性能。
TRACE 回显服务器收到的请求，主要用于测试或诊断POST http://www.example.com HTTP/1.1 Content-Type: application/x-www-form-urlencoded;charset=utf-8 .....省略 title=test&sub%5B%5D=1&sub%5B%5D=2&sub%5B%5D=3
POST http://www.example.com HTTP/1.1 Content-Type:multipart/form-data; boundary=----WebKitFormBoundaryrGKCBY7qhFd3TrwA ------WebKitFormBoundaryrGKCBY7qhFd3TrwA Content-Disposition: form-data; name="text" title ------WebKitFormBoundaryrGKCBY7qhFd3TrwA Content-Disposition: form-data; name="file"; filename="chrome.png" Content-Type: image/png PNG ... content of chrome.png ... ------WebKitFormBoundaryrGKCBY7qhFd3TrwA--
POST http://www.example.com HTTP/1.1
Content-Type: application/json;charset=utf-8
{"title":"test","sub":[1,2,3]}
POST http://www.example.com HTTP/1.1
Content-Type: text/xml
<methodcall>
<methodname>examples.getStateName</methodname>
<params>
<param />
<value><i4>41</i4></value>
</params>
</methodcall>keep alive 需client-server兩邊配合 http 1.0中默認是關閉的，需要在http頭加入"Connection: Keep-Alive”，才能啓用Keep-Alive； http 1.1中默認啓用Keep-Alive，如果加入"Connection: close “，才關閉。 目前大部分瀏覽器都是用http1.1協議，也就是說默認都會發起Keep-Alive的連接請求了 所以是否能完成一個完整的Keep- Alive連接就看服務器設置情況。
TCP connection -> connection -> channel
Producer -> exchange -> Queue -> exchange -> Consumer
Queue -> exchange -> Consumer
輪流派送給每個註冊的worker
msgs, err := ch.Consume(
q.Name, // queue
"", // consumer
false, // auto-ack
false, // exclusive
false, // no-local
false, // no-wait
nil, // args
)
//幾本上auto-ack都要設成true，不然就要自己送
//否則rabbitmq 會保留此message，造成資源消耗
go func() {
for d := range msgs {
log.Printf("Received a message: %s", d.Body)
dot_count := bytes.Count(d.Body, []byte("."))
t := time.Duration(dot_count)
time.Sleep(t * time.Second)
log.Printf("Done")
d.Ack(false)
}
}()
q, err := ch.QueueDeclare(
"hello", // name
true, // durable
false, // delete when unused
false, // exclusive
false, // no-wait
nil, // arguments
)
//producer、consumer宣告的queue durable要設成true
//宣告同名的queue參數必須相同，否則錯誤
err = ch.Publish(
"", // exchange
q.Name, // routing key
false, // mandatory
false,
amqp.Publishing {
DeliveryMode: amqp.Persistent,
ContentType: "text/plain",
Body: []byte(body),
})
//publishing DeliveryMode 要設成 amqp.Persistent
基本上RabbitMQ的派送是平均派送，當他收到就派送， 所以有可能派送給還沒完成工作的worker。 可設定prefetch count=1 這時rabbitMQ會收到前一個message的acknowledgement才會派送下一個。 注意，此時queue有可能被填滿，你需要多設定幾個woker。 err = ch.Qos( 1, // prefetch count 0, // prefetch size false, // global )
4 types of exchange:direct,topic,headers,fanout err = ch.ExchangeDeclare( "logs", // name "fanout", // type true, // durable false, // auto-deleted false, // internal false, // no-wait nil, // arguments ) //fanout:broadcast all messages to all the queues it knows
err = ch.QueueBind( q.Name, // queue name "", // routing key "logs", // exchange false, nil )
exchange publish時，可以加上路由(routing key) queue可以綁定exchange及routing key 一個queue可以綁定一個exchange及多個routing key 這樣就可以一個exchange 用多種routing發布，然後consumer利用不同routing接收
//Binding 是綁定exchange 及 queue //Binding時可以設定路由，用routing key parameter err = ch.QueueBind( q.Name, // queue name "black", // routing key "logs", // exchange false, nil) //route to black
//用direct exchange才能使用binding的routing key
//用fanout exchange會忽略routing key參數，合理，所以他才叫fanout
err = ch.ExchangeDeclare(
"logs_direct", // name
"direct", // type
true, // durable
false, // auto-deleted
false, // internal
false, // no-wait
nil, // arguments
)
q, err := ch.QueueDeclare(
"", // name
false, // durable
false, // delete when usused
true, // exclusive
false, // no-wait
nil, // arguments
)
err = ch.QueueBind(
q.Name, // queue name
"", // routing key
"logs", // exchange
false,
nil
)
4 types of exchange:direct,topic,headers,fanout err = ch.ExchangeDeclare( "logs", // name "fanout", // type true, // durable false, // auto-deleted false, // internal false, // no-wait nil, // arguments ) //fanout:broadcast all messages to all the queues it knows
err = ch.QueueBind( q.Name, // queue name "", // routing key "logs", // exchange false, nil )
systemctl start rabbitmq-server
相關的scripts及cli tools安裝在/usr/local/opt/rabbitmq/sbin，
需要自己加到path
export PATH=$PATH:/usr/local/opt/rabbitmq/sbin
brew services start rabbitmq brew services stoprabbitmq啟動在前景
/usr/local/Cellar/rabbitmq/3.7.11/sbin/rabbitmq-server
rabbitmqctl add_user admin admin更改使用者tag，改成管理者 set_user_tags
rabbitmqctl set_user_tags admin administrator更改使用者權限 set_permissions [name]
rabbitmqctl set_permissions -p / username ".*" ".*" ".*"更改密碼 change_password [username] [password]
rabbitmqctl change_password admin admin查詢未確認的message(unacknowledged) list_queues [queueName] messages_ready messages_unacknowledged
sudo rabbitmqctl list_queues queueName messages_ready messages_unacknowledged
rabbitmq-plugins enable rabbitmq-management
rabbitmq-plugins [-n [node]] [-t [timeout]] [-l] [-q] [command] [command options] Eg. rabbitmq-plugins [-n] [-t ] [-l] [-q] is_enabled [plugin1] [plugin2]
-n node -q quiet -h help list 列出所有外掛 is_enabled [plugin1][,[plugin2]] 查看plugin是否啟用 enable [plugin] 啟用外掛
rabbitmq-plugins enable rabbitmq_management