Update documentation

README.md

@@ -9,18 +9,17 @@ Primary goal of this project is to build Hadoop cluster. But the most part is ge
 Locally installed:
 
 * [Terraform](https://www.terraform.io/)
-* [Ansible](https://www.ansible.com/)
 
 Configuration:
 
 * public part of ssh key uploaded to OpenStack
 * ssh-agent with ssh key
-* configured access to OpenStack (for example downloaded *cloud.yaml* file or the environment set)
+* configured access to OpenStack, see [Cloud Documentation](https://docs.cloud.muni.cz/cloud/cli/#getting-credentials) (either downloaded *cloud.yaml* file or the environment set)
 * floating IP created
 
 # Hadoop image
 
-To setup Hadoop on single machine, launch:
+To setup Hadoop on single machine using Hadoop image, launch:
 
     /usr/local/sbin/hadoop-setup.sh
 
@@ -40,6 +39,7 @@ For example (check also the other values used in *variables.tf*):
     flavor = "standard.large"  # >4GB memory needed
     EOF
 
+    terraform init
     terraform apply
 
 # Build cluster
@@ -62,6 +62,7 @@ For example (check also the other values used in *variables.tf*):
     #
     # 2. launch the setup
     #
+    terraform init
     terraform apply
 
 # Destroy cluster
@@ -94,7 +95,7 @@ The public IP is in the *public_hosts* file or *inventory* file.
 
 On the terraform client machine:
 
-    # decrease number of nodes in terraform
+    # increase number of nodes in terraform
     vim *.auto.tfvars
 
     # check the output
@@ -115,7 +116,7 @@ Data must be migrated from the removed nodes first in the Hadoop cluster. Theore
 
 On the master machine:
 
-    # add nodes to remove (it must be the nodes with the highest numbers), for example:
+    # nodes to remove (it must be the nodes with the highest numbers), for example:
     echo node3.terra >> /etc/hadoop/conf/excludes
 
     # refresh configuration
@@ -151,8 +152,10 @@ On the master machine:
 
 Launch */usr/local/sbin/hadoop-adduser.sh USER_NAME* in the whole cluster.
 
-For example using Ansible (replace *$USER\_NAME* by the user name):
+For example using Ansible from the master machine (replace *$USER\_NAME* by the new user name):
 
+    sudo su -l deployadm
+    cd ~/terraform
     ansible -i ./inventory -m command -a "/usr/local/sbin/hadoop-adduser.sh $USER_NAME" all
 
 The generated password is written on the output and stored in the home directory.