[k8s] 建立使用者及namespace

建立namespaces

kubectl create ns slanla

建立user

kubectl -n tw-sgis create sa slanla

RBAC 授權

建立規則

cat <<EOF > slanla-user-role.yml
kind: Role
apiVersion: rbac.authorization.k8s.io/v1
metadata:
  namespace: tw-sgis
  name: slanla-user-pod
rules:
- apiGroups: ["*"]
  resources: ["pods", "pods/log"]
  verbs: ["get", "watch", "list", "update", "create", "delete"]
EOF
kubectl apply -f slanla-user-role.yml

授權對象

kubectl create rolebinding slanla-view-pod \
  --role=slanla-user-pod \
  --serviceaccount=tw-sgis:slanla \
  --namespace=tw-sgis

產生設定檔

取得 secret 資訊

SECRET=$(kubectl -n tw-sgis get sa slanla -o go-template='{{range .secrets}}{{.name}}{{end}}')

設定API Server

API_SERVER="https://xxx.xxx.xxx.xxx:6443"

取得 ca

CA_CERT=$(kubectl -n tw-sgis get secret ${SECRET} -o yaml | awk '/ca.crt:/{print $2}')

建立

cat <<EOF > slanla.conf
apiVersion: v1
kind: Config
clusters:
- cluster:
    certificate-authority-data: $CA_CERT
    server: $API_SERVER
  name: cluster
EOF

取得token

TOKEN=$(kubectl -n tw-sgis get secret ${SECRET} -o go-template='{{.data.token}}')

設定 token

kubectl config set-credentials slanla-user \
  --token=`echo ${TOKEN} | base64 -d` \
  --kubeconfig=slanla.conf

建立context: default

kubectl config set-context default \
  --cluster=cluster \
  --user=slanla-user \
  --kubeconfig=slanla.conf

指定context: default

kubectl config use-context default \
  --kubeconfig=slanla.conf

SQL, 帳號密碼查詢的建議做法

測試資料:

INSERT INTO `test` (`user`, `pswd`) VALUES ('test', 'ABcd+1234');

一般常見做法

SELECT `user` FROM `test` WHERE `user`='test' and `pswd`=sha1('ABcd+1234')

較安全做法,但是會增加DB CPU的功耗!

SELECT `user` FROM `test` WHERE `user`='test' and sha1(CONCAT(`pswd`,9999))=sha1(CONCAT(sha1('ABcd+1234'),9999))

centsos 基本安裝參考指令

#更新
yum update -y && yum autoremove -y

#安裝常用工具,如vim/wget/openssh-server/nslookup/ping/ifconfig
yum install -y git vim wget openssh* nfs-utils nfs-utils-lib open-vm-tools net-tools bind-utils iputils yum-utils

#設定ssh
mkdir -p ~/.ssh
cat <<EOF > ~/.ssh/config
Host *
    StrictHostKeyChecking no
EOF

#關閉swap
SWAPLINE=$(cat /etc/fstab | grep swap | awk '{print $1}' | sed 's/\//\\\//g')
sed -i "s/$SWAPLINE/#$SWAPLINE/g" /etc/fstab 
swapoff -a
free -m

#關閉SELINUX
setenforce 0
sed -i s/^SELINUX=.*$/SELINUX=disabled/ /etc/selinux/config
systemctl disable firewalld.service
systemctl disable libvirtd.service

#Forward Policy
iptables -P FORWARD ACCEPT

#關閉防火牆
iptables -P FORWARD ACCEPT
systemctl stop firewalld
systemctl disable firewalld

#NTP校時
yum install ntp ntpdate ntp-doc -y
cat > /etc/ntp.conf  <<EOL
restrict 127.0.0.1
restrict ::1
server time.stdtime.gov.tw  minpoll 1 maxpoll 3
server tock.stdtime.gov.tw  minpoll 2 maxpoll 3
server watch.stdtime.gov.tw minpoll 3 maxpoll 4
server clock.stdtime.gov.tw minpoll 4 maxpoll 5
server tick.stdtime.gov.tw  minpoll 5 maxpoll 6
includefile /etc/ntp/crypto/pw
keys /etc/ntp/keys
disable monitor
EOL

systemctl stop ntpd
ntpdate time.stdtime.gov.tw
systemctl enable ntpd
systemctl start ntpd
ntpq -p

[code] post

function post($url, $post){
  $context = array();
  if (is_array($post)){
    ksort($post);
    $context['http'] = array(
      'method' => 'POST',
      'content' => http_build_query($post, '', '&')
    );
  }
  else{
    $context['http'] = array(
      'method' => 'POST',
      'content' => $post
    );
  }
  return @file_get_contents($url, false, stream_context_create($context));
}

miniconda 安裝

安裝 miniconda

wget https://repo.anaconda.com/miniconda/Miniconda3-latest-MacOSX-x86_64.sh -O ~/miniconda.sh
bash ~/miniconda.sh -b -p $HOME/miniconda

路徑設定

echo 'PATH="$HOME/miniconda/bin:$PATH"' >> ~/.bash_profile 
chmod +x ~/.bash_profile
PATH="$HOME/miniconda/bin:$PATH"

git windows 換行問題

git在windows下對於pull下來檔案的換行有三種處理方式:

  1. true: check out時自動將\n轉換成\r\n,commit時將\r\n轉成\n.
  2. input: check out時不轉換\n,commit時將\r\n轉成\n.
  3. false: 不做任何轉換

若不清楚目前設定是哪一種,可以用下列指令查詢:

git config core.autocrlf

若要修改成input,則可用下列指令修改(請用超級管理者執行命令提示字元)

git config --system core.autocrlf input

或是(一般使用者)

git config --global core.autocrlf input

chmod 設定權限

設定test資料夾下的所有檔案權限

find test -type f -exec chmod 644 {} +

設定test資料夾下的所有資料夾權限

find test -type d -exec chmod 755 {} +

generator & list on python

generator不同於list,沒有list,且只能遊走一次.
下面的code可以發現generator的元素是在被用的時候才產生.

import time

b=[time.strftime("%Y-%m-%d %H:%M:%S", time.localtime()) for i in range(3)]

time.sleep(1)
print("A:",time.strftime("%Y-%m-%d %H:%M:%S", time.localtime()))
time.sleep(1)

for ii in b:
  print("B:",ii)
  time.sleep(1)

###########################################################################

b=(time.strftime("%Y-%m-%d %H:%M:%S", time.localtime()) for i in range(3))

time.sleep(1)
print("C:",time.strftime("%Y-%m-%d %H:%M:%S", time.localtime()))
time.sleep(1)

for ii in b:
  print("D:",ii)
  time.sleep(1)