centos atomic host第一次启动

centos atomic host安装完成会，第一次启动时会调用cloud-init等服务。这是个什么东东？

cloud-init用于在创建虚拟机时通过元数据服务对虚拟机基本配置，包括常见的主机名，用户，密码等等。cloud-init会在启动的过程中分四个阶段运行，按照时间顺序分为：

1. cloud-init-local
2. cloud-init
3. cloud-config
4. cloud-final

控制cloud-init配置行为的方式有两种：cloudinit的配置文件(/etc/cloud/cloud.cfg)和数据源（如openstack及ec2中的userdata）

系统安装时我禁用cloud-init，以下就是atomic的cloud-init本地配置文件

# cat cloud.cfg
users:
 - default

disable_root: 1　# 禁用root远程登录
ssh_pwauth:   0  # 禁用ssh密码认证, 改为1

locale_configfile: /etc/sysconfig/i18n
mount_default_fields: [~, ~, 'auto', 'defaults,nofail', '0', '2']
resize_rootfs_tmp: /dev
ssh_deletekeys:   0
ssh_genkeytypes:  ~
syslog_fix_perms: ~

cloud_init_modules:
 - migrator
 - bootcmd
 - write-files
 - growpart
 - resizefs
 - set_hostname
 - update_hostname
 - update_etc_hosts
 - rsyslog
 - users-groups
 - ssh

cloud_config_modules:
 - mounts
 - locale
 - set-passwords
 - yum-add-repo
 - package-update-upgrade-install
 - timezone
 - puppet
 - chef
 - salt-minion
 - mcollective
 - disable-ec2-metadata
 - runcmd

cloud_final_modules:
 - rightscale_userdata
 - scripts-per-once
 - scripts-per-boot
 - scripts-per-instance
 - scripts-user
 - ssh-authkey-fingerprints
 - keys-to-console
 - phone-home
 - final-message

system_info:
  default_user:
    name: centos
    lock_passwd: true # centos用户被锁密码，改为false
    passwd: $6$MySalt$0jzR1u/sSfVjQ2h6Udn4reCOEjj9/.pVHfAp7bWDoUd7cfi0GYsFqn9EL9a2MQP4sMZoVOlX4UeGKVUbwYE/N. #增加：设置密码
    gecos: Cloud User
    groups: [wheel, adm, systemd-journal]
    sudo: ["ALL=(ALL) NOPASSWD:ALL"]
    shell: /bin/bash
  distro: rhel
  paths:
    cloud_dir: /var/lib/cloud
    templates_dir: /etc/cloud/templates
  ssh_svcname: sshd

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