# 配置Cloud-Init
在安装完Cloud-Init后，需要配置cloud.cfg文件，用于定制Cloud-Init在iMetal服务器初始化时的功能配置。
1. 使用vi编辑器修改"/etc/cloud/cloud.cfg"配置文件为以下内容。 
   ```
   # The top level settings are used as module
   # and system configuration.
   # A set of users which may be applied and/or used by various modules
   # when a 'default' entry is found it will reference the 'default_user'
   # from the distro configuration specified below
   users:
    - name: root
      lock_passwd: False
   # If this is set, 'root' will not be able to ssh in and they
   # will get a message to login instead as the default $user
   disable_root: false
   ssh_pwauth: true
   # This will cause the set+update hostname module to not operate (if true)
   preserve_hostname: false
   #manage_etc_hosts: localhost
   network:
     config: disabled
   apt:
     preserve_sources_list: true
   # Example datasource config
   # datasource:
   #    Ec2:
   #      metadata_urls: [ 'blah.com' ]
   #      timeout: 5 # (defaults to 50 seconds)
   #      max_wait: 10 # (defaults to 120 seconds)
   datasource_list: [ OpenStack ]
   datasource:
     OpenStack:
       metadata_urls: ['http://169.254.169.254/clouddc']
       max_wait: 300
       timeout: 5
       apply_network_config: false
   # The modules that run in the 'init' stage
   cloud_init_modules:
    - ssh
    - migrator
    - seed_random
    - bootcmd
    - write-files
    - growpart
    - resizefs
    - disk_setup
    - mounts
    - set_hostname
   # - update_hostname
    - update_etc_hosts
    - ca-certs
    - rsyslog
    - users-groups
   # The modules that run in the 'config' stage
   cloud_config_modules:
   # Emit the cloud config ready event
   # this can be used by upstart jobs for 'start on cloud-config'.
    - emit_upstart
    - snap
    - snap_config  # DEPRECATED- Drop in version 18.2
    - ssh-import-id
    - locale
    - set-passwords
    - grub-dpkg
    - apt-pipelining
    - apt-configure
    - ubuntu-advantage
    - ntp
    - timezone
    - disable-ec2-metadata
    - runcmd
    - byobu
   # The modules that run in the 'final' stage
   cloud_final_modules:
    - snappy  # DEPRECATED- Drop in version 18.2
    - package-update-upgrade-install
    - fan
    - landscape
    - lxd
    - ubuntu-drivers
    - puppet
    - chef
    - mcollective
    - salt-minion
    - rightscale_userdata
    - scripts-vendor
    - scripts-per-once
    - scripts-per-boot
    - scripts-per-instance
    - scripts-user
    - ssh-authkey-fingerprints
    - keys-to-console
    - phone-home
    - final-message
    - power-state-change
   # System and/or distro specific settings
   # (not accessible to handlers/transforms)
   system_info:
      # This will affect which distro class gets used
      distro: ubuntu
      paths:
         cloud_dir: /var/lib/cloud/
         templates_dir: /etc/cloud/templates/
         upstart_dir: /etc/init/
      ssh_svcname: ssh
   ```
   
   
2. 配置自动扩容。 
   需要确保OS已安装growpart工具，UEFI引导还需额外安装gdisk工具
   ```
   sudo tee /etc/cloud/cloud.cfg.d/99-force-growroot.cfg <<EOF 
   resize_rootfs: true 
   growpart: 
     mode: 
   auto EOF
   ```
   
   
3. 执行vi /lib/systemd/system/cloud-init-local.service配置cloud-init-local.service自启动项。 
   ![](https://support.huaweicloud.com/usermanual-clouddc/public_sys-resources/caution_3.0-zh-cn.png)
   注意依赖顺序，依赖顺序错误会导致cloud-init不生效。
   ```
   # /lib/systemd/system/cloud-init-local.service
   [Unit]
   Description=Initial cloud-init job (pre-networking)
   DefaultDependencies=no
   Wants=network-pre.target
   After=systemd-remount-fs.service
   Before=NetworkManager.service
   Before=network-pre.target
   Before=shutdown.target
   Before=sysinit.target
   Conflicts=shutdown.target
   RequiresMountsFor=/var/lib/cloud
   [Service]
   Type=oneshot
   ExecStart=/usr/bin/cloud-init init --local
   ExecStart=/bin/touch /run/cloud-init/network-config-ready
   RemainAfterExit=yes
   TimeoutSec=0
   # Output needs to appear in instance console output
   StandardOutput=journal+console
   [Install]
   WantedBy=cloud-init.target
   ```
   
   
4. 执行vi /lib/systemd/system/cloud-init.service配置cloud-init.service自启动项。 
   ![](https://support.huaweicloud.com/usermanual-clouddc/public_sys-resources/caution_3.0-zh-cn.png)
   注意依赖顺序，依赖顺序错误会导致cloud-init不生效。
   ```
   [Unit]
   Description=Initial cloud-init job (metadata service crawler)
   DefaultDependencies=no
   Wants=cloud-init-local.service
   Wants=sshd-keygen.service
   Wants=sshd.service
   Wants=jarvis-network-config.service
   After=cloud-init-local.service
   After=network-online.target
   Before=sshd-keygen.service
   Before=sshd.service
   Before=systemd-user-sessions.service
   Conflicts=shutdown.target
   [Service]
   Type=oneshot
   ExecStart=/usr/bin/cloud-init init
   RemainAfterExit=yes
   TimeoutSec=0
   # Output needs to appear in instance console output
   StandardOutput=journal+console
   [Install]
   WantedBy=cloud-init.target
   ```