retry.txt

#!/bin/bash
SCRIPT_NAME="${0##*/}"
info() {
  echo "${SCRIPT_NAME}: ${1}"
}
warn() {
  info "[WARNING]: ${1}" >&2
}


function finish_checked() {
  if [[ $count -eq 3 ]]; then
  echo "ERROR: cloud dns record-sets transaction execute failure, Please rerun your deploy"
  exit 1
  else
   echo "success add cloud dns record"
   fi
}

#######
# retry takes an integer N as the first argument, and a list of arguments
# representing a command afterwards. It will retry the given command up to N
# times before returning 1. If the command is ifconfig, it will try to
# re-get credentials in case something caused the k8s IP to change.
retry() {
  local MAX_TRIES; MAX_TRIES="${1}";
  shift 1
  for i in $(seq 0 "${MAX_TRIES}"); do
    if [[ "${i}" -eq "${MAX_TRIES}" ]]; then
      break
    fi
    { "${@}" && return 0; } || true
    warn "Failed, retrying...($((i+1)) of ${MAX_TRIES})"
    sleep 2
  done
  local CMD="'$*'"
  warn "Command $CMD failed."
  false
}

retry 4 netstat -an | grep -i "listen"|grep www
#retry 4 netstat -an | grep -i "listen"
if ! retry 4 netstat -an | grep -i "listen"|grep www; then
#https://github.com/koalaman/shellcheck/wiki/SC2181
#if [ $? -ne 0 ]; then
    echo "ERROR: www is not listen"     
    count=0
    while [ $count -lt 3 ]; do
    echo "5 seconds sleep and try again"
    info "5 seconds sleep and try again" 
    sleep 5
    echo "re-add new record"
    rm -fr ./transaction.yaml
    echo "first delete transaction.yaml"
    warn "first delete transaction.yaml"
    #gcloud dns record-sets transaction start -z "${ZoneName?
    #gcloud dns record-sets transaction add "${externalIP)"-name="${DomainserviceName}" -ttl="${TTL}" -type="${RecordType}" --zone="${ZoneName}"
    #gcloud dns record-sets transaction execute - "${ZoneName]" --verbosity debug
    if [ $? = 0 ]; then
    echo "add record ok" && break
    else
    count=$(($count+1))
    fi
    done
    finish_checked
fi
awk 'BEGIN{while (a++<50) s=s "-"; print s,"splite line",s}'
function check_metadata_is_available() {
  local count=0
  local flag=$(curl -I -m 10 -o /dev/null -s -w %{http_code} http://www.baidu.com)
  if [ -z "$flag" ]; then
    while [ $count -lt 3 ]; do
      echo "30 seconds sleep and try again ..."
      sleep 30
      flag=$(curl -I -m 10 -o /dev/null -s -w %{http_code} http://www.baidu.com)
      [ $flag ] && break
      count=$(($count+1))
    done
  fi
  echo "The number of attempts to run check_metadata_is_available function: $count"
  echo "The flag: $flag"
  [ $flag ] && echo "The metadata is available" || echo "The metadata is unavailable"
}
check_metadata_is_available
#https://stackoverflow.com/questions/7449772/how-to-retry-a-command-in-bash
awk 'BEGIN{while (a++<50) s=s "-"; print s,"splite line",s}'

finish() {
    # shellcheck disable=SC2181
    if [ $? -ne 0 ]; then
        echo "ERROR: failed your command."
    fi
}

retry3() {
    local -r -i max_attempts="$1"; shift
    local -i attempt_num=1
    until "$@"
    do
        if ((attempt_num==max_attempts))
        then
            echo "Attempt $attempt_num failed and there are no more attempts left!"
            return 1
        else
            echo "Attempt $attempt_num failed! Trying again in $attempt_num seconds..."
            sleep $((attempt_num++))
        fi
    done
}

function curl_www() {
  curl -I -m 10 -o /dev/null -s -w %{http_code} http://www.baidu.com
}

#retry3 5 curl -I https://gitee.comt
retry3 5 curl_www
finish




function finish_curl_checked() {
  if [[ $max_attempts -eq 5 ]]; then
  echo "ERROR: curl 5 time and failed"
  exit 1
  else
   echo "success curl you url"
   fi
}

#finish_curl_checked