Zeroplex 生活隨筆

$ ls -lh | grep php
-rw-rw-r--  1 zero zero  178 Aug 22 19:15 autoload.php
drwxrwxr-x  3 zero zero 4.0K Aug 22 19:01 cakephp
drwxrwxr-x  5 zero zero 4.0K Aug 22 19:01 phpdocumentor
drwxrwxr-x  3 zero zero 4.0K Aug 22 19:01 phpoffice
drwxrwxr-x  3 zero zero 4.0K Aug 22 19:01 phpoption
drwxrwxr-x  3 zero zero 4.0K Aug 22 19:01 phpseclib
drwxrwxr-x  3 zero zero 4.0K Aug 22 19:01 phpspec
drwxrwxr-x  8 zero zero 4.0K Aug 22 19:01 phpunit

$ ls -lh | grep php --color=always | less
-rw-rw-r--  1 zero zero  178 Aug 22 19:15 autoload.php
drwxrwxr-x  3 zero zero 4.0K Aug 22 19:01 cakephp
drwxrwxr-x  5 zero zero 4.0K Aug 22 19:01 phpdocumentor
drwxrwxr-x  3 zero zero 4.0K Aug 22 19:01 phpoffice
drwxrwxr-x  3 zero zero 4.0K Aug 22 19:01 phpoption
drwxrwxr-x  3 zero zero 4.0K Aug 22 19:01 phpseclib
drwxrwxr-x  3 zero zero 4.0K Aug 22 19:01 phpspec
drwxrwxr-x  8 zero zero 4.0K Aug 22 19:01 phpunit

Welcome to Ubuntu 16.04.6 LTS (GNU/Linux 4.4.0-142-generic x86_64)

 * Documentation:  https://help.ubuntu.com
 * Management:     https://landscape.canonical.com
 * Support:        https://ubuntu.com/advantage

0 packages can be updated.
0 updates are security updates.


*** System restart required ***

$ ls /var/run
acpid.pid      crond.reboot         initctl         log          motd.dynamic          resolvconf         snapd.socket  udev
acpid.socket   dbus                 initramfs       lvm          mount                 rsyslogd.pid       sshd          unattended-upgrades.lock
agetty.reload  dhclient.enp0s3.pid  init.upgraded   lvmetad.pid  mysqld                screen             sshd.pid      user
atd.pid        dmeventd-client      irqbalance.pid  lxcfs        network               sendsigs.omit.d    sudo          utmp
blkid          dmeventd-server      iscsid.pid      lxcfs.pid    reboot-required       shm                systemd       uuidd
crond.pid      grub                 lock            mdadm        reboot-required.pkgs  snapd-snap.socket  tmpfiles.d    xtables.lock

alter user 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY 'your-password';
flush privileges;

[mysqld]
default-authentication-plugin = mysql_native_password

• 輸入法：沒有順手的輸入法 (倉頡)
• Office 文件工具組：LibreOffice 的操作實在很不直覺，從 M$ 跳到 LibreOffice 目前還沒聽過有人說好用的。

• query-cache-type
• query-cache-size
• innodb_large_prefix

• 桌上型電腦主機 (待機)：120 瓦
• 風扇 .... 不屑跳過 XD
• 筆電：變壓器最高支援到 60 瓦，所以最高就是 60 瓦
• 冰箱 (舊型，冷藏、冷凍分離 2 公尺高)：200 瓦
• 舊洗衣機：250 瓦
• 除濕機 (省電一級、變頻)：150 瓦 (有點強)
• 舊窗型冷氣機：3000+ 瓦

$table->foreign('good_id')
    ->references('id')
    ->on('goods')
    ->onDelete('cascade');

$table->index('value');

show create table NAME

• Version: June 2019
• Release Date: 2019-06-20
• Kernal version: 4.19

• Localization
• Locale：en_US.utf8 + zh_TW.utf8
• 時區：Asia/Taipei
• 鍵盤對應：en (US)
• Wify county：TW
• SSH 預設啟動
• 有線網路自動 DHCP
• /etc/apt/source.list 的 source 改為 NCHC (快超多)
• 已經做過一次 apt-get update && apt-get upgrade

載點：https://mega.nz/#F!dR5EVABL!Nkynwg5ivQuRyRqpGz1Q4A

SHA1: 71664d5651d660077621f91b29edeecf4810a486
SHA256: 981a8ded523c30f06ec09292445255c55a862e5d756b4e0fff5f8d069ef35afa

$ wget http://...... -O RPIO.zip
$ unzip RPIO.zip
$ python RPIO/setup.py install
....
running install
running bdist_egg
error: error in 'egg_base' option: 'source' does not exist or is not a directory

$ cd RPIO
$ python setup.py install

<?php

use PHPUnit\Framework\TestCase;

class LibTest extends TestCase
{
    public function setUp(): void
    {
        $this->data = null;
    }

    public function tearDown(): void
    {
        $this->data = null;
    }

    public function testOne()
    {
        $this->data = 123;
        $this->assertEquals(123, $this->data);

        return $this->data;
    }

    /**
     * @depends testOne
     */
    public function testTwo($data)
    {
        $this->assertEquals(123, $this->data);
    }
}

// -----

PHPUnit 8.2.3 by Sebastian Bergmann and contributors.

.F

class TargetController extends Controller
{
    public function doSomething(Request $req)
    {
        // do something ....
    }
}

$req = new \lluminate\Http\Request();

$ctrl = new TargetController()
$result = $ctrl->doSomething($req);

$request->replace([
    'key' => 'value',
]);

• Illuminate\Http\Request | Laravel API
• Unit Testing Your Laravel Controllers - Matthew Daly's Blog

 => A, C, B, C, A, A, C, A, B, C, B =>

 => A, C, B, C, A, A, A .... (x1000), A, A, C, A, B, C, B =>

• 直接關店不在讓其他客人點餐，專心處理大量訂單
• 餐廳仍然讓客人點餐，且會在客人與訂單有相同餐點時，一起處理餐點並同時出餐，所以客人會在大量訂單處理完之前，即可以收到餐點並離開

queue for A: t999, t998, t997, ...., t3, t2, t1
queue for B: t3, t2, t1
queue for C: t6, t5, t4, t3, t2, t1

step 1: C, B, A, A, A, A, A, C, A
step 2: C, B, A, A, A, A, A, C
step 3: C, B, A, A, A, A, A
step 4: C, B, A, A, A, A
step 5: C, B, A, A, A  // 連續處理二個 A task 了，到達上限
step 6: A, C, B, A, A
step 7: A, A, C, B, A
step 8: A, A, A, C, B
step 8: A, A, A, C
....

1. 先設定好 EC2 的基本權限 (IAM)
2. 要支援 CodeDeploy 的 EC2 instance 必須安裝 CodeDeploy agent (很重要，EC2 上 trigger event 都是靠這個 agent）
3. 設定 CodeDeploy 上 Application 對應到的 EC2 instances
4. User 先將打包好的 code 送到 S3 上存放
5. 接下來 trigger application 上特定的  deploy-er，將特定版本的 code 從 S3 上派送到 EC2 instance 上
6. EC2 instance 的 CodeDeploy agent 收到 event 以後，會按照 appspec.yml 中指定的動作來動作，操作完成會回傳 status 給 CodeDeploy。
7. CodeDeploy 會在 pannel 顯示 deploy 的進度和狀態。

• EC2 只要 restart 後 IP 都會改變
• RSync based 在 SSH 上，所以再次連線都會有 hand shake 問題 (known_hosts)
• 要連上 EC2 需要 ssh -i my.PEM，把這個 PEM 塞進 Pipeline 或是參數都是好方法

    - step:
        name: Deploy to EC2
        deployment: test
        caches:
        script:
            - apt-get update && apt-get install -y zip unzip rsync openssh-client ssh
            - rm -fr .git vendor
            - curl -sS https://getcomposer.org/installer | php -- --install-dir=/usr/local/bin --filename=composer
            - composer --version
            - composer install --no-interaction --no-progress --prefer-dist --no-dev
            - chmod 600 u18-micro.pem
            - echo '|1|gdwZ6TN1l9.............GOqLzzpGY=' > ${HOME}/.ssh/known_hosts
            - rsync -av --delete --force --progress -e "ssh -i my-ec2.pem" ./ ubuntu@${Host}:/var/www/

$ mate-screensaver-command -h
Usage:
  mate-screensaver-command [OPTION…]

Help Options:
  -h, --help                 Show help options

Application Options:
  --exit                     Causes the screensaver to exit gracefully
  -q, --query                Query the state of the screensaver
  -t, --time                 Query the length of time the screensaver has been active
  -l, --lock                 Tells the running screensaver process to lock the screen immediately
  -c, --cycle                If the screensaver is active then switch to another graphics demo
  -a, --activate             Turn the screensaver on (blank the screen)
  -d, --deactivate           If the screensaver is active then deactivate it (un-blank the screen)
  -p, --poke                 Poke the running screensaver to simulate user activity
  -i, --inhibit              Inhibit the screensaver from activating.  Command blocks while inhibit is active.
  -n, --application-name     The calling application that is inhibiting the screensaver
  -r, --reason               The reason for inhibiting the screensaver
  -V, --version              Version of this application

#!/usr/bin/env bash

set -e

R=`ls /dev/ | grep sd`

echo "Results found:"
echo $R

$ bash -xv qwe.sh 
#!/usr/bin/env bash

set -e
+ set -e

R=`ls /dev/ | grep sd`
++ ls /dev/
++ grep sd
+ R=

• set -e 的設定
• grep 的 exit code

$ cd .
$ echo $?
0
$ mkdir app
mkdir: cannot create directory ‘app’: File exists
echo $?
1

docker kill $(docker ps -q)

docker rm $(docker ps -a -q)

docker rmi $(docker images -q)

innodb_large_prefix
innodb_file_per_table = 1
innodb_file_format=Barracuda
innodb_default_row_format=DYNAMIC

[mysqld]
character-set-server=utf8mb4
collation-server=utf8mb4_general_ci
innodb_large_prefix
innodb_file_per_table = 1
innodb_file_format=Barracuda
innodb_default_row_format=DYNAMIC

[mysqldump]
default-character-set = utf8mb4

[client]
default-character-set = utf8mb4

[mysqld]
default-storage-engine         = InnoDB
character-set-server           = utf8mb4
collation-server               = utf8mb4_unicode_ci
init_connect='SET collation_connection = utf8mb4_unicode_ci'
init_connect='SET NAMES utf8mb4'

• 以上設定檔適用於 MySQL / Percona server 5.7，不同版本有不同的 config keyword
• 上面的範例為 utf8mb4，可自行調整成自己需要的 character set
• 就算 MySQL server 有這些設定以後，連線到 MySQL 的程式也需要注意編碼設定，否則還是會發生編碼錯誤

• 到各縣市維修站點送修
• 參考 Garmin 官方網頁說明，請客服協助處理

# ifupdown has been replaced by netplan(5) on this system.  See
# /etc/netplan for current configuration.
# To re-enable ifupdown on this system, you can run:
#    sudo apt install ifupdown

確認網路介面的 ID

$ ifconfig -a
ens33: flags=4163  mtu 1500
        inet 192.168.0.102  netmask 255.255.255.0  broadcast 192.168.0.255
        inet6 fe80::20c:29ff:fead:d664  prefixlen 64  scopeid 0x20
        ....

修改網路設定檔

network:
    ethernets:
        ens33:
            addresses: []
            dhcp4: true
    version: 2

network:
    ethernets:
        ens33:
            addresses: [192.168.0.10/24]
            gateway4: 192.168.0.1
            nameservers: 
                addresses: [8.8.8.8, 1.1.1.1]
            dhcp4: false
    version: 2

$ sudo netplan apply

• Linux kernel 更新至 4.19.13
• Metasploit 更新至 v5.0

list = [0, 1, 2, 3, 4]

list.count()

# 寫可以這樣寫
list.count

list.fetch(3)  # 3

# 刮號可以省略
list.fetch 3  # 3

list = [1, 2, 3]

# 這個應該沒什麼問題
list.fetch(1) + 5  # 7

# 這個就很容易誤會了
list.fetch 1 + 5  # IndexError

• GD library 的 security fix
• mbstring 的 bug fix
• Phar 的 security fix
• xmlrpc 的 security fix