Upgrade TiFlash Nodes

Before the upgrade, make sure that the cluster is started. To upgrade TiFlash nodes, take the following steps:

1. Back up the tidb-ansible folder:

   mv tidb-ansible tidb-ansible-bak
   

2. Download tidb-ansible that corresponds to the tag of TiDB v3.1:

   git clone -b $tag https://github.com/pingcap/tidb-ansible.git
   

3. Download binary:

   ansible-playbook local_prepare.yml
   

4. Edit the inventory.ini file.

5. Rolling upgrade TiFlash:

   ansible-playbook rolling_update.yml --tags tiflash
   

6. Rolling upgrade the TiDB monitoring component:

   ansible-playbook rolling_update_monitor.yml