yum install -y epel-release
yum install -y nginx

sudo apt install zookeeperd
sudo systemctl enable zookeeper
sudo systemctl restart zookeeper

root@stretch:/var/lib/zookeeper# /usr/share/zookeeper/bin/zkCli.sh
Connecting to localhost:2181
Welcome to ZooKeeper!
JLine support is enabled
WATCHER::
WatchedEvent state:SyncConnected type:None path:null

[zk: localhost:2181(CONNECTED) 0] ls /
[zookeeper]
[zk: localhost:2181(CONNECTED) 1]

[zk: localhost:2181(CONNECTED) 0] create /config.json {}
Created /config.json
[zk: localhost:2181(CONNECTED) 1]

[zk: localhost:2181(CONNECTED) 0] get /config.json
{}
cZxid = 0xb
ctime = Fri Apr 03 17:27:50 GMT+00:00 2020
mZxid = 0xb
mtime = Fri Apr 03 17:27:50 GMT+00:00 2020
pZxid = 0xb
cversion = 0
dataVersion = 0
aclVersion = 0
ephemeralOwner = 0x0
dataLength = 2
numChildren = 0
[zk: localhost:2181(CONNECTED) 1]

[zk: localhost:2181(CONNECTED) 0] delete /config.json
[zk: localhost:2181(CONNECTED) 1]

brew install deployer

最近使用 macOS zsh ssh 登录远程服务器时候，终端会出现如下提示内容：

-bash: warning: setlocale: LC_CTYPE: cannot change locale (UTF-8): No such file or directory

显示中文字符时会不规则的乱码，有些字符乱，有些字符不乱

解决办法是编辑 ~/.zshrc 文件，手动设置一下终端环境的语言编码：

export LANG=en_US.UTF-8
export LC_ALL=en_US.UTF-8

Laravel 可以在通过 APP_ENV 环境变量修改运行时环境，默认的 APP_ENV 是 local，其实他还可以设置其他值，分别是：

local 对应的 development 环境
testing 对应的 test 环境
production 对应的 production 环境

当使用PHPUnit测试的PHP代码中包含session_start()时，就会出现以下的错误提示：

PHPUnit 4.8.36 by Sebastian Bergmann and contributors.

E

Time: 110 ms, Memory: 12.00MB

There was 1 error:

1) ExampleTest::testBasicExample
ErrorException: session_start(): Cannot start session when headers already sent

解决办法是打开phpunit.xml文件，设置processIsolation属性为true

网上有很多 CentOS 7 安装 Tomcat 8 教程，都是从 Apache 官网下载二进制包后解压启动，随意性太强。没有通过系统包管理来维护是不完美的。

yum install https://harbottle.gitlab.io/harbottle-main/7/x86_64/harbottle-main-release.rpm
yum install tomcat8

systemctl enable tomcat8
systemctl restart tomcat8

部署的时候把 war 文件放到 /var/lib/tomcat8/webapps 目录下即可。

sudo dphys-swapfile swapoff
sudo dphys-swapfile uninstall
sudo systemctl disable dphys-swapfile

SQL*Plus 默认执行完之后，按上下左右键效果是上图的样子，非常不爽。

yum install -y epel-release
yum install -y rlwrap

之后使用 rlwrap sqlplus 来启动，效果就非常完美了

snap install docker

配置文件位置是在

/var/snap/docker/current/config/daemon.json

{
    "registry-mirrors": ["https://registry.docker-cn.com"],
    "log-level":        "error",
    "storage-driver":   "aufs"
}