Ansible学习记录三：配置文件

　0.配置文件

　　　两个核心文件：ansible.cfg和hosts文件,默认都存放在/etc/ansible目录下。

　　　ansible.cfg：主要设置一些ansible初始化的信息，比如日志存放路径、模块、插件等配置信息

　　　hosts：机器清单，进行分组管理

　1.ansible.cfg

# config file for ansible -- http://ansible.com/
# ==============================================

# nearly all parameters can be overridden in ansible-playbook
# or with command line flags. ansible will read ANSIBLE_CONFIG,
# ansible.cfg in the current working directory, .ansible.cfg in
# the home directory or /etc/ansible/ansible.cfg, whichever it
# finds first

[defaults]   --->通用默认配置

# some basic default values...

inventory      = /etc/ansible/hosts     这个是默认库文件位置,脚本,或者存放可通信主机的目录
#library        = /usr/share/my_modules/   Ansible默认搜寻模块的位置
remote_tmp     = $HOME/.ansible/tmp   Ansible 通过远程传输模块到远程主机,然后远程执行,执行后在清理现场.在有些场景下,你也许想使用默认路径希望像更换补丁一样使用
pattern        = *    如果没有提供“hosts”节点,这是playbook要通信的默认主机组.默认值是对所有主机通信
forks          =     在与主机通信时的默认并行进程数 ，默认是5d
poll_interval  =     当具体的poll interval 没有定义时,多少时间回查一下这些任务的状态, 默认值是5秒
sudo_user      = root   sudo使用的默认用户 ，默认是root
#ask_sudo_pass = True   用来控制Ansible playbook 在执行sudo之前是否询问sudo密码.默认为no
#ask_pass      = True    控制Ansible playbook 是否会自动默认弹出密码
transport      = smart   通信机制.默认 值为’smart’。如果本地系统支持 ControlPersist技术的话,将会使用(基于OpenSSH)‘ssh’,如果不支持讲使用‘paramiko’.其他传输选项包括‘local’, ‘chroot’,’jail’等等
#remote_port    =     远程SSH端口。 默认是22
module_lang    = C   模块和系统之间通信的计算机语言，默认是C语言

# plays will gather facts by default, which contain information about
# the remote system.
#
# smart - gather by default, but don't regather if already gathered
# implicit - gather by default, turn off with gather_facts: False
# explicit - do not gather by default, must say gather_facts: True
gathering = implicit   控制默认facts收集（远程系统变量）. 默认值为’implicit’, 每一次play,facts都会被收集

# additional paths to search for roles in, colon separated
#roles_path    = /etc/ansible/roles   roles 路径指的是’roles/’下的额外目录,用于playbook搜索Ansible roles

# uncomment this to disable SSH key host checking
#host_key_checking = False    检查主机密钥

# change this for alternative sudo implementations
sudo_exe = sudo     如果在其他远程主机上使用另一种方式执sudu操作.可以使用该参数进行更换

# what flags to pass to sudo   传递sudo之外的参数
#sudo_flags = -H

# SSH timeout    SSH超时时间
timeout = 

# default user to use for playbooks if user is not specified
# (/usr/bin/ansible will use current user as default)
#remote_user = root   使用/usr/bin/ansible-playbook链接的默认用户名，如果不指定，会使用当前登录的用户名

# logging is off by default unless this path is defined
# if so defined, consider logrotate
#log_path = /var/log/ansible.log     日志文件存放路径

# default module name for /usr/bin/ansible
#module_name = command     ansible命令执行默认的模块

# use this shell for commands executed under sudo
# you may need to change this to bin/bash in rare instances
# if sudo is constrained
#executable = /bin/sh     在sudo环境下产生一个shell交互接口. 用户只在/bin/bash的或者sudo限制的一些场景中需要修改

# if inventory variables overlap, does the higher precedence one win
# or are hash values merged together?  The default is 'replace' but
# this can also be set to 'merge'.
#hash_behaviour = replace    特定的优先级覆盖变量

# list any Jinja2 extensions to enable here:
#jinja2_extensions = jinja2.ext.do,jinja2.ext.i18n      允许开启Jinja2拓展模块

# if set, always use this private key file for authentication, same as
# if passing --private-key to ansible or ansible-playbook
#private_key_file = /path/to/file         私钥文件存储位置

# format of string {{ ansible_managed }} available within Jinja2
# templates indicates to users editing templates files will be replaced.
# replacing {file}, {host} and {uid} and strftime codes with proper values.
ansible_managed = Ansible managed: {file} modified on %Y-%m-%d %H:%M:%S by {uid} on {host}   这个设置可以告知用户,Ansible修改了一个文件,并且手动写入的内容可能已经被覆盖.

# by default, ansible-playbook will display "Skipping [host]" if it determines a task
# should not be run on a host.  Set this to "False" if you don't want to see these "Skipping"
# messages. NOTE: the task header will still be shown regardless of whether or not the
# task is skipped.
#display_skipped_hosts = True     显示任何跳过任务的状态 ，默认是显示

# by default (as of 1.3), Ansible will raise errors when attempting to dereference
# Jinja2 variables that are not set in templates or action lines. Uncomment this line
# to revert the behavior to pre-1.3.
#error_on_undefined_vars = False      如果所引用的变量名称错误的话, 将会导致ansible在执行步骤上失败

# by default (as of 1.6), Ansible may display warnings based on the configuration of the
# system running ansible itself. This may include warnings about 3rd party packages or
# other conditions that should be resolved if possible.
# to disable these warnings, set the following value to False:
#system_warnings = True    允许禁用系统运行ansible相关的潜在问题警告

# by default (as of 1.4), Ansible may display deprecation warnings for language
# features that should no longer be used and will be removed in future versions.
# to disable these warnings, set the following value to False:
#deprecation_warnings = True     允许在ansible-playbook输出结果中禁用“不建议使用”警告

# (as of 1.8), Ansible can optionally warn when usage of the shell and
# command module appear to be simplified by using a default Ansible module
# instead.  These warnings can be silenced by adjusting the following
# setting or adding warn=yes or warn=no to the end of the command line
# parameter string.  This will for example suggest using the git module
# instead of shelling out to the git command.
# command_warnings = False    当shell和命令行模块被默认模块简化的时,Ansible 将默认发出警告

# set plugin path directories here, separate with colons
action_plugins     = /usr/share/ansible_plugins/action_plugins
callback_plugins   = /usr/share/ansible_plugins/callback_plugins
connection_plugins = /usr/share/ansible_plugins/connection_plugins
lookup_plugins     = /usr/share/ansible_plugins/lookup_plugins
vars_plugins       = /usr/share/ansible_plugins/vars_plugins
filter_plugins     = /usr/share/ansible_plugins/filter_plugins

# by default callbacks are not loaded for /bin/ansible, enable this if you
# want, for example, a notification or logging callback to also apply to
# /bin/ansible runs
#bin_ansible_callbacks = False    用来控制callback插件是否在运行 /usr/bin/ansible 的时候被加载. 这个模块将用于命令行的日志系统,发出通知等特性

# don't like cows?  that's unfortunate.
# set to  if you don't want cowsay support or export ANSIBLE_NOCOWS=1
#nocows =     默认ansible可以调用一些cowsay的特性   开启/禁用：/

# don't like colors either?
# set to  if you don't want colors, or export ANSIBLE_NOCOLOR=1
#nocolor =   输出带上颜色区别， 开启/关闭：/

# the CA certificate path used for validating SSL certs. This path
# should exist on the controlling node, not the target nodes
# common locations:
# RHEL/CentOS: /etc/pki/tls/certs/ca-bundle.crt
# Fedora     : /etc/pki/ca-trust/extracted/pem/tls-ca-bundle.pem
# Ubuntu     : /usr/share/ca-certificates/cacert.org/cacert.org.crt
#ca_file_path =    

# the http user-agent string to use when fetching urls. Some web server
# operators block the default urllib user agent as it is frequently used
# by malicious attacks/scripts, so we set it to something unique to
# avoid issues.
#http_user_agent = ansible-agent

# if set to a persistent type (not 'memory', for example 'redis') fact values
# from previous runs in Ansible will be stored.  This may be useful when
# wanting to use, for example, IP information from one group of servers
# without having to talk to them in the same playbook run to get their
# current IP information.
fact_caching = memory

# retry files
#retry_files_enabled = False
#retry_files_save_path = ~/.ansible-retry

[privilege_escalation]
#become=True
#become_method=sudo
#become_user=root
#become_ask_pass=False

[paramiko_connection]

# uncomment this line to cause the paramiko connection plugin to not record new host
# keys encountered.  Increases performance on new host additions.  Setting works independently of the
# host key checking setting above.
#record_host_keys=False

# by default, Ansible requests a pseudo-terminal for commands executed under sudo. Uncomment this
# line to disable this behaviour.
#pty=False

[ssh_connection]

# ssh arguments to use
# Leaving off ControlPersist will result in poor performance, so use
# paramiko on older platforms rather than removing it
#ssh_args = -o ControlMaster=auto -o ControlPersist=60s

# The path to use for the ControlPath sockets. This defaults to
# "%(directory)s/ansible-ssh-%%h-%%p-%%r", however on some systems with
# very long hostnames or very long path names (caused by long user names or
# deeply nested home directories) this can exceed the character limit on
# file socket names ( characters for most platforms). In that case, you
# may wish to shorten the string below.
#
# Example:
# control_path = %(directory)s/%%h-%%r
#control_path = %(directory)s/ansible-ssh-%%h-%%p-%%r

# Enabling pipelining reduces the number of SSH operations required to
# execute a module on the remote server. This can result in a significant
# performance improvement when enabled, however when using "sudo:" you must
# first disable 'requiretty' in /etc/sudoers
#
# By default, this option is disabled to preserve compatibility with
# sudoers configurations that have requiretty (the default on many distros).
#
#pipelining = False

# if True, make ansible use scp if the connection type is ssh
# (default is sftp)
#scp_if_ssh = True

[accelerate]
accelerate_port =
accelerate_timeout =
accelerate_connect_timeout = 5.0

# The daemon timeout is measured in minutes. This time is measured
# from the last activity to the accelerate daemon.
accelerate_daemon_timeout =  

# If set to yes, accelerate_multi_key will allow multiple
# private keys to be uploaded to it, though each user must
# have access to the system via SSH to add a new key. The default
# is "no".
#accelerate_multi_key = yes

[selinux]
# file systems that require special treatment when dealing with security context
# the default behaviour that copies the existing context or uses the user default
# needs to be changed to use the file system dependant context.
#special_context_filesystems=nfs,vboxsf,fuse

简易配置：

[defaults]
inventory      = /etc/ansible/hosts
sudo_user=root
remote_port=
host_key_checking=False
remote_user=root
log_path=/var/log/ansible.log
module_name=command
private_key_file=/root/.ssh/id_rsa
no_log:True

　2.hosts

# This is the default ansible 'hosts' file.
#
# It should live in /etc/ansible/hosts
#
#   - Comments begin with the '#' character
#   - Blank lines are ignored
#   - Groups of hosts are delimited by [header] elements
#   - You can enter hostnames or ip addresses
#   - A hostname/ip can be a member of multiple groups

# Ex : Ungrouped hosts, specify before any group headers.

green.example.com
blue.example.com
192.168.100.1
192.168.100.10

# Ex : A collection of hosts belonging to the 'webservers' group

[webservers]
alpha.example.org
beta.example.org
192.168.1.100
192.168.1.110

# If you have multiple hosts following a pattern you can specify
# them like this:

www[:].example.com

# Ex : A collection of database servers in the 'dbservers' group

[dbservers]

db01.intranet.mydomain.net
db02.intranet.mydomain.net
10.25.1.56
10.25.1.57

# Here's another example of host ranges, this time there are no
# leading 0s:

db-[:]-node.example.com

3.参考资料

　Ansible配置文件

　http://www.ansible.com.cn/docs/intro_configuration.html#environmental-configuration