egregiously unimportant stuff. Menu. Setting hostname with Ansible. 11 May 2017 on ansible.- name: change hostname to myserver hostname: name: "webserver". The second module, lineinfile, is used to modify the localhost line in /etc/ hosts. - name: postgresql user with ssh key user: generatesshkey: yes home: /var/lib/postgresql name: postgres. Add key of remote hosts (name and IP) from two groups in the Ansible inventory, correctly reporting if added or already present Additionally, inventoryhostname is the name of the hostname as configured in Ansibles inventory host file. This can be useful for when you dont want to rely on the discovered hostname ansiblehostname or for other mysterious reasons. localaction so is the host to run the ansible-playbook command, no matter alone is what is written in the hosts, it will be executed in the localhost.Host name automatic number assignment. To tell Ansible about the new hosts file, add -i ansible/hosts.ini. Its -i because the hosts file is known as your inventory.As soon as we do that, instead of using the IP address in the command, we can use the group name Variables fill in the contents of template files, can be used for the source of files, and to choose whether or not to perform a task (to name some reasons).
Ansible also sources host variables and group variables from hostvars and groupvars stored in the inventory directory. now check the file to have a clear view off all variables (facts) collected by ansible for your host like the well known inventoryhostname . To list the fact directly in your playbook you have to set gatherfacts: True in your playbook. Giving it a name serves as better documentation and makes it easier to see what host servers are in play during a task. Ansible makes it easy to alias host servers. For example, we can name our host staging like so Starting from v2.0 Ansible supports variable substitution in task/handler names: https://github.com/ansible/ansible/issues/10347, so these examples will work as expected: - name: upgrade software on inventoryhostname - name: current host is ansiblehostname. By default the file /etc/ansible/host is your inventory. Both the ansible and ansible-playbook commands take the -i argument toWe will use both of the variables later on in the playbook. In this example the strongswanservice variable containes the name of the service running strongSwan. Im setting up an Ansible playbook to set up a couple servers. There are a couple of tasks that I only want to run if the current host is my local dev host, named "local" in my hosts file. How can I do this? The basic syntax consists of ansible then the host group from hosts to run against, -m , and optionally providing arguments via -a "OPTARGS".Please note that specifying a user can sometime conflict with a user defined in /etc/ ansible/hosts.
Lets say if we want to exclude host1 and host2 from ansible-playbook execution use following command: ansible-playbook --limit !hoost1:!host2 yourPlaybook.yml.Name (required). Website. Much simpler way to run. Wouldnt it be cool if we just have to say ansible-playbook helloworld.yml instead of ansible-playbook -i "localhost," -c local helloworld.yml. Its easy to do it using default inventory file /etc/ ansible/hosts. Ansible is an extra-simple tool/framework/API for doing remote. things. This is the adhoc command that allows for a single task. playbook run. ARGUMENTS. host-pattern. A name of a group in the inventory, a shell-like glob selecting. You can get the hostname by using inventoryhostname and the group by using group names. I have tried things like hostvars[ inventoryhostname ][ ansiblesshhost] and[control] control ansibleconnectionlocal. Проблема в том, что при запуске команды ansible --list-hosts all я вижу I have implemented Ansible for managing configuration on a large number AWS instances.- hosts: dev remoteuser: user sudo: yes vars: env: dev hostname: dev-web- roles: - common - supervisor.add the new hostname to the hosts file - name: add to hosts lineinfile: > dest/etc/ hosts regexp Ansible 2 recommends only the comma: foo,bar. This usage applies to the list of target hosts: for a play, the host patternThe upshot is that the code—for the first time—now imposes syntactic requirements on host names, addresses, and patterns in a systematic, documented, testable way. Now, were gonna create our first playbook: playbook is a key concept in Ansible. It defines what needs to be configured and executed on your hosts. Add a file named deploy.yml in the same folder as your inventory with the following content ansible-playbook .yml. We can see in the screenshot above that our task is getting executed Nginx being installed. Step 7: Lets check if Nginx is installed on my host machine. Managed Hosts entries are stored in a host inventory file, it is a text file on control node which consists of managed host name or ip addresses. In Ansible we can manage two type hosts inventory i.e static and dynamic. In Ansible you can access other host variables using hostvars[hostname] but not group variables.The group vars for the appservers contain the following information to configure the virtual hosts: --- apachevhost: example.cluster.nl: name: example.cluster.nl docroot Ansible is completely agent-less, meaning you dont have to install any software on your managed hosts. All commands are run through Ansible via SSH and if Ansible needs updating you only need to update yourNo problem, pass the group name to the CLI command and Ansible will handle the rest. Ideally Id like to SSH to a server via its Ansible hostname rather than having to look up its IP or machine name.
The SSH user for each host is that same, ansible in my example. The hosts are defined in the default location /etc/ ansible/hosts or a file ending in hosts under the current working [gituserip ] cat /etc/ansible/hosts [local] localhost ansiblesshusergituser. User gituser will both run the playbook and be the remote SSH user. I put remote in quotes because Ansible is just going to SSH back to localhost. As alluded to above, setting the following variables controls how ansible interacts with remote hosts. Some we have already mentioned: ansiblesshhost The name of the host to connect to, if different from the alias you wish to give to it. Ansible playbook and file-system layout: [/sources/ansible] tree . . get-os-version.yaml groupvars linux hosts home archive.jbldata.com jbllnxwks.jbldata.com yoga2.jbldata.com hostvars. In the dev/inventory file we put the Ansible hosts config with .ans.local hostnames. This is how it looks in our setupWe are going to assign hostname as a name of container to reference them easily when needed. These shorter variables are ignored, without warning, in older versions of Ansible. General for all connections: ansiblehost The name of the host to connect to, if different from the alias you wish to give to it. ansibleport The ssh port number, if not 22 ansibleuser The default ssh user name to use. server1 ansiblesshhostserver1.xxx.com.--- hosts: frontendservers. tasks: - name: testing. command: copy some file. when: host part of frontendcluster1 group. I only want the command to be executed for server1 and server2? Ansible uses host files to define the hosts to manage with optional their variables to be used in playbooks.See pages that link to and include this page. Change the name (also URL address, possibly the category) of the page. View wiki source for this page without editing. The use of ansiblefacts in the return value is an Ansible idiom. If a module returns a dictionary that contains ansiblefacts as a key, then Ansible will create variable names in the environment with those values and associate them with the active host. For modules that return facts, theres no need to Heres an example task: - name: Create motd template: src"motd.j2" dest"/etc/motd". The file motd.j2 (placed in the templates-subdirectory of your role) could then look like this: Welcome to host ansiblehostname! ansiblehostname will then be replaced with the hostname. - hosts: ansibletutorial tasks: - debug: msg: Test of Ansible Playbook! First line contains host(s) that we want to provision.You might note that there is also task named setup . This is Ansible internal task for gathering information about the server. [hosts] 10.0.0.1 ansibleconnectionssh ansiblesshuserroot ansiblesshpassmyrootpassword. As we dont have SSH key access we need to tell Ansible to use an alternative method.The name of this user is defined at the top of the playbook as a variable. - name: Install Ansible yum: nameansible statelatest. -hosts: managedNodes - name: Check if servers are alive ping: Ansible was installed but there was an error in my code(the group name was spelled incorrectly in the host file) host: Ubuntu 16.04 4.4.0. SUMMARY. If I provide the DNS mapping of a remote hostname in the hosts file through the ansiblehost variable, ansible is "unable to resolve host name". Read ansible man page on Linux: man 1 ansible. NAME. ansible - run a task on a target host(s). SYNOPSIS.host-pattern. A name of a group in the inventory, a shell-like glob selecting hosts in inventory or any combination of the two separated by commas. It is important that DNS name resolution as well as reverse IP resolution works properly from Ansible host to the target Windows host. We can also check the availability of WinRM on the target host using curl But note that variable names have some restrictions in Ansible: Variable names should be letters, numbers, and underscores.When this task is run against a set of systems, the all get a file called abcapp.conf containing the individual host name of the given system. However, reading Ansible Inventory doc, I added ansibleuser to the hosts file, [nodes] host1 ansibleuserroot host2 ansibleuserrootPost as a guest. Name. Before Ansible can configure hosts, it needs to know their names. ansible -i hosts -m ping all. Another useful module for debugging is setup, which returns all the facts (detected host info) that can be used during setup Add an entry for the host name bound to the hosts default external IPv4 address (optional) Add entries for basic IPv6 addresses, e.g. ip6-localnet (optional) Add entries for Ansible managed hosts (optional) Add entries specified in Yaml (optional, see below) Basic usage of the ansible command accepts the host group which is apache, and the module name which is ping It is okay if these files do not exist, as this is an optional feature. As an advanced use case, you can create directories named after your groups or hosts, and Ansible will read all the files in these directories. An empty name for the hosts - server-name-1. A host variable that then gives this name an IP address to refer to - ansiblehostremote.one.ip.address. Another host variable with the specific username like in the previous example - ansibleuserusername. It checks it can connect to each host, which makes checking the hosts file for correctness easy. Basic usage of the ansible command accepts the host group, and the module name: ansible -m . Troubleshooting: In case you have recently changed the name of the host, verify first that after you have changed the host name of the target, you have also changed the localhost entry in /etc/ hosts. Issue 9. When you are executing an Ansible playbook Today I was looking how you can populate an ssh knownhosts file with ansible.Therefore its the item of the current item, causing it to be named item.item. As an example, this is the output of sshknown hostresults when I scan for both github.com, bitbucket.org (both already in my known [email protected]: ansible -i hosts production -m yum -a namevsftpd stateabsent -u root 220.127.116.11 | success >> "changed": false, "msg": "", "rc": 0, "results": [ "vsftpd is not installed" ] . First time when we run the ansible command it removed the VsFTPD package and then we run it