motd

展示类似这种登录信息

对于docker来说，登录有两种方式，一种是ssh登录，一种是docker exec命令进入。利用现有的motd机制，只能对于ssh 登录有效。motd机制介绍如下，以ubunt系统为例：
/etc/motd 文件里添加静态内容，所见既所得。
/etc/update-motd.d/ 目录下面添加一些脚本，该目录下文件以文件名开头数字顺序执行：

如果想对docker exec命令进入也生效，必须采用shell配置的方式，
比如添加 /etc/profile里，或者添加到 ~/.bashrc 里
source /etc/damodel_motd.sh

另，一种shell艺术字
apt update && apt install -y figlet
shell字体颜色设置：https://blog.csdn.net/yetugeng/article/details/89978787

cat /etc/damodel_motd.sh

#!/bin/bash
text=`figlet welcome to DaModel`
echo -e "\033[1;47;31m ${text} \033[0m"

printf "
"
echo -e "\033[7;1;34m 目录说明: \033[0m
"
printf "╔══════════════════════╦══════════╦═════╦═════════════════════════════════════════════════════════════════════════╗
"
printf "║目                  录║名      称║速 度║说明                                                                     ║
"
printf "╠══════════════════════╬══════════╬═════╬═════════════════════════════════════════════════════════════════════════╣
"
printf "║/                     ║系  统  盘║一 般║实例关机数据会丢失，会随保存镜像一起保存。                               ║
"
printf "╠══════════════════════╬══════════╬═════╬═════════════════════════════════════════════════════════════════════════╣
"
printf "║/root/workspace/      ║本地数据盘║ 快  ║实例关机数据会丢失，可存放读写IO要求高的数据。但不会随保存镜像一起保存。 ║
"
printf "╠══════════════════════╬══════════╬═════╬═════════════════════════════════════════════════════════════════════════╣
"
printf "║/root/shared-storage/ ║网      盘║ 慢  ║可以实现多实例间的文件同步共享，不受实例开关机和保存镜像的影响。         ║
"
printf "╚══════════════════════╩══════════╩═════╩═════════════════════════════════════════════════════════════════════════╝
"

if [[ -n "$MOUNT_INFO" ]]; then
    if [[ -f "/etc/mount_info.sh" ]]; then
            /etc/mount_info.sh
    fi
else
    echo "未挂载云磁盘"
fi

printf "
"
printf "
"

if test -f "/sys/fs/cgroup/cpu/cpu.cfs_quota_us"; then
  cfs_quota_us=$(cat /sys/fs/cgroup/cpu/cpu.cfs_quota_us)
  cfs_period_us=$(cat /sys/fs/cgroup/cpu/cpu.cfs_period_us)
  if [ $cfs_quota_us -ge $cfs_period_us ];then
      cores=$((cfs_quota_us / cfs_period_us))
  else
      cores=0.$((cfs_quota_us * 10 / cfs_period_us))
  fi
  printf "CPU ：%s 核心
" ${cores}

  limit_in_bytes=$(cat /sys/fs/cgroup/memory/memory.limit_in_bytes)
  memory="$((limit_in_bytes / 1024 / 1024 / 1024)) GB"
  printf "内存：%s
" "${memory}"
else
  cores=$(cat /sys/fs/cgroup/cpu.max | awk '{print $1/$2}')
  printf "CPU ：%s 核心
" ${cores}

  limit_in_bytes=$(cat /sys/fs/cgroup/memory.max)
  memory="$((limit_in_bytes / 1024 / 1024 / 1024)) GB"
  printf "内存：%s
" "${memory}"
fi

if type nvidia-smi >/dev/null 2>&1; then
  gpu=$(nvidia-smi -i 0 --query-gpu=name,count --format=csv,noheader)
  printf "GPU ：%s
" "${gpu}"
fi

echo ""
echo -e  "\033[1;31m                            🔥🔥🔥💣 注意: 💣🔥🔥🔥  \033[0m "
echo -e "\033[7;1;31m 1.系统盘较小请将大的数据存放于本地数据盘或网盘中，重置系统时本地数据盘和网盘中的数据不受影响。 \033[0m "
echo -e "\033[7;1;31m 2./root/workspace/下内容，释放实例时不保存，制作镜像时也不保存。\033[0m "
echo -e "\033[7;1;31m 3.用户在创建云磁盘时可以选择是否随实例释放，如果有重要数据建议不要勾选'随实例释放'。\033[0m "