What does it mean when you get an error that consul could not be found?
How to verify that the installation of consul worked?
What is retry_join in a consul?
What file does Consul use?
What is consul command?
Can you run Consul on any system?
Does Consul use defaults?
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What is Consul key value?
Consul KV is a core feature of Consul and is installed with the Consul agent. Once installed with the agent, it will have reasonable defaults. Consul KV allows users to store indexed objects, though its main uses are storing configuration parameters and metadata.
Which is default port for the DNS interface in Consul?
:8600By default, Consul will listen on 127.0. 0.1:8600 for DNS queries in the consul.
What is Consul agent?
»Consul Agent The consul agent command is the heart of Consul: it runs the agent that performs the important task of maintaining membership information, running checks, announcing services, handling queries, etc. Due to the power and flexibility of this command, the Consul agent is documented in its own section.
What is Consul ACL token?
The acl token command is used to manage Consul's ACL tokens. It exposes commands for creating, updating, reading, deleting, and listing tokens. This command is available in Consul 1.4. 0 and newer. ACL tokens may also be managed via the HTTP API.
Which command is used for DNS queries in Consul?
Query Consul DNS and BIND You can use the following example service configuration file and registration command. To ensure that Consul DNS and your DNS server are configured correctly, use a dig query for the service you've registered. $ dig @127.0. 0.1 -p 8600 +short -x 172.16.
Which port is used by HTTP interface by default?
80Most browsers make HTTP requests on ports 80 and 443 by default. Typically, the default configuration option is for servers to listen on all IP addresses on port 80.
Where is Consul used?
Consul is a distributed, highly available, datacenter-aware, service discovery and configuration system. It can be used to present services and nodes in a flexible and powerful interface that allows clients to always have an up-to-date view of the infrastructure they are a part of.
What is Consul used for?
Consul is a multi-networking tool that offers a fully-featured service mesh solution that solves the networking and security challenges of operating microservices and cloud infrastructure. Consul offers a software-driven approach to routing and segmentation.
How do you set up a Consul?
These setup steps should be completed on all Consul hosts.Install Consul.Verify the installation.Prepare the security credentials.Configure Consul agents.Server specific configuration.Client specific configuration.Apply Enterprise license.Configure the Consul process.More items...
What is Consul terraform?
Consul is a service networking platform which provides service discovery, service mesh, and application configuration capabilities. The Consul provider exposes resources used to interact with a Consul cluster. Configuration of the provider is optional, as it provides reasonable defaults for all arguments.
How do you access the Consul UI?
You can view the output of Consul UI using the following command over any agent. The output would be as shown in the following screenshot. By default, you will observe the UI at http://localhost:8500/ui. The /ui part is same as the consul's HTTP API.
Which tokens are injected during cluster bootstrapping when ACLS are enabled?
The anonymous token is created during the bootstrap process, consul acl bootstrap . It is implicitly used if no token is supplied.
How do you access the Consul UI?
You can view the output of Consul UI using the following command over any agent. The output would be as shown in the following screenshot. By default, you will observe the UI at http://localhost:8500/ui. The /ui part is same as the consul's HTTP API.
What is SRV record in DNS?
The SRV record is a Domain Name System (DNS) resource record. It's used to identify computers hosting specific services. SRV resource records are used to locate domain controllers for Active Directory.
What is Consul connect?
Consul Service Mesh provides service-to-service connection authorization and encryption using mutual Transport Layer Security (TLS). Consul Connect is used interchangeably with the name Consul Service Mesh and is what this document will use to refer to for Service Mesh functionality within Consul.
How do I set up Consul?
Install & Configure Consul Agent On Client ModeStep 1: Update the package repositories and install unzip. ... Step 2: Head over to consul downloads page. ... Step 3: Download the consul binary to /opt directory. ... Step 4: Unzip consul binary. ... Step 5: Move consul executable to /usr/bin directory to be accessible system-wide.More items...•
What does it mean when you get an error that consul could not be found?
If you get an error that consul could not be found, your PATH environment variable was not set up properly. Make sure that your PATH variable contains the directory where you installed Consul.
How to verify that the installation of consul worked?
After installing Consul, verify that the installation worked by opening a new terminal session and running the command consul.
What is retry_join in a consul?
The retry_join parameter allows you to configure all Consul agents to automatically form a datacenter using a common Consul server accessed via DNS address, IP address or using Cloud Auto-join. This removes the need to manually join the Consul datacenter nodes together.
What file does Consul use?
Consul client agents typically require a subset of configuration required by Consul server agents. All Consul clients can use the consul.hcl file created earlier in the configuring the Consul agents section. If you have added host-specific configuration such as identifiers, you will need to set these individually.
What is consul command?
The consul command features opt-in autocompletion for flags, subcommands, and arguments (where supported). Enable autocompletion.
Can you run Consul on any system?
All commands in this section can be completed on any system with the Consul binary installed. The outputs and artifacts from these commands should be archived in a secure location for future reference.
Does Consul use defaults?
Consul uses documented reasonable defaults so only non-default values must be set in the configuration file. Configuration can be read from multiple files and is loaded in lexical order. Check the full description for more information about configuration loading and merge semantics.
What does it mean when a new Consul agent starts?
When a new Consul agent starts, it doesn't know about other agents; it is essentially a datacenter with one member. To add a new agent to an existing datacenter you give it the IP address of any other agent in the datacenter (either a client or a server), which causes the new agent to join the datacenter.
What is data-dir in a consulate?
data-dir - This flag tells Consul agents where they should store their state, which can include sensitive data like ACL tokens for both servers and clients. In production deployments you should be careful about the permissions for this directory.
How to create a virtual machine with Consul?
Create a new file in the directory called Vagrantfile and paste the content of Consul's demo Vagrant file into it. Then save the file. This file will tell Vagrant to create two virtual machines on your computer with the Consul binary preinstalled.
What is it called when more than half of the servers must be in communication with each other at all times for the data?
This is called maintaining quorum . You can learn more about the quorum requirements of servers in the architecture documentation.
How to know if agent 2 joined a VM?
Switch to the terminal window where your Consul server is running on the first VM, and you'll notice some log output indicating that agent two joined it.
How many agents can you run on the same computer?
Consul is a distributed application that is designed to have one agent per machine. To run two agents on the same computer you will need to install VirtualBox, and Vagrant, which will run virtual machines to simulate a distributed environment.
What does server - Providing this flag specify?
server - Providing this flag specifies that you want the agent to start in server mode.
What is a consul agent?
Consul agent is the core process of Consul. The agent maintains membership information, registers services, runs checks, responds to queries, etc. Any agent can be run in one of two modes: Client or Server. These two modes can be used according to their role as decided when using consul.
Where is the settings option in Consul?
You can check the settings option of the Consul UI on the top right hand side of the screen. Upon clicking that option, you can easily see that Consul provides you an option using which you can configure its local storage settings and token system for verification.
What is Consul in Hashicorp?
Consul is a Hashicorp based tool for discovering and configuring a variety of different services in your infrastructure. It is based and built on Golang. One of the core reasons to build Consul was to maintain the services present in the distributed systems. Some of the significant features that Consul provides are as follows.
What is a consul member?
Consul members can be defined as the list of different agents and server modes using which a consul cluster is deployed. Consul provides us with a command line feature using which we can easily list all the agents associated with consul.
What is consensus protocol?
Consensus Protocol. Consensus protocol is used by Consul to provide Consistency as described by the CAP Theorem. This protocol is based on the Raft Algorithm. When implementing Consensus protocol, the Raft Algorithm is used where raft nodes are always in any one of the three states: Follower, Candidate or Leader.
How to turn on ACL in Consul?
One of the easiest way to turn on the ACL’s is to add a new json file in Consul’s data directory. To enable and update the ACL, you can add the master ACL token in the field in settings, and refresh it using the ACL tab
Why is snapshot important in consul?
Snapshots are an essential and important part for managing the Consul cluster in case of backups. By default, Consul provides us a way to save snapshots of the consul cluster. Consul provides us four separate sub-commands using which we can use consul to create snapshots, which are −
Where is the settings option in Consul?
Settings. You can check the settings option of the Consul UI on the top right hand side of the screen. Upon clicking that option, you can easily see that Consul provides you an option using which you can configure its local storage settings and token system for verification.
What is consul interface?
Consul provides us with a useful interface using that we can manage things at ease. You can easily bring up the consul user interface on any port you desire. The Consul UI can be divided into three important parts, which are −
What is Consul UI?
The Consul UI also provides you a Services tab to configure and view services that are currently deployed using Consul. It provides us an option to configure services depending on the nodes.
How to turn on ACL in Consul?
One of the easiest way to turn on the ACL’s is to add a new json file in Consul’s data directory. To enable and update the ACL, you can add the master ACL token in the field in settings, and refresh it using the ACL tab
Can the datacenter option be changed?
The datacenter option can be easily changed and switched over by choice. The Consul UI automatically updates the detection of the number of data centers Consul is working on.
What does it mean when you get an error that consul could not be found?
If you get an error that consul could not be found, your PATH environment variable was not set up properly. Make sure that your PATH variable contains the directory where you installed Consul.
How to verify that the installation of consul worked?
After installing Consul, verify that the installation worked by opening a new terminal session and running the command consul.
What is retry_join in a consul?
The retry_join parameter allows you to configure all Consul agents to automatically form a datacenter using a common Consul server accessed via DNS address, IP address or using Cloud Auto-join. This removes the need to manually join the Consul datacenter nodes together.
What file does Consul use?
Consul client agents typically require a subset of configuration required by Consul server agents. All Consul clients can use the consul.hcl file created earlier in the configuring the Consul agents section. If you have added host-specific configuration such as identifiers, you will need to set these individually.
What is consul command?
The consul command features opt-in autocompletion for flags, subcommands, and arguments (where supported). Enable autocompletion.
Can you run Consul on any system?
All commands in this section can be completed on any system with the Consul binary installed. The outputs and artifacts from these commands should be archived in a secure location for future reference.
Does Consul use defaults?
Consul uses documented reasonable defaults so only non-default values must be set in the configuration file. Configuration can be read from multiple files and is loaded in lexical order. Check the full description for more information about configuration loading and merge semantics.