====== Update on CentOS 7 ======
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<note warning>**Attention!** This guide is applicable **only for CentOS 7**. If you are using CentOS 8 or VEOS, ignore this guide.</note>

Due to certain limitations in ClickHouse, changes were made to the dependencies of our fastor package. These changes ensure the correct functioning of the package on CentOS 8 and VEOS, but may cause issues on CentOS 7 due to the inability to handle the specified dependencies.

===== Step-by-Step Guide =====

**Step 1.** If you are receiving large amounts of data, it is recommended to:
  - Stop the receivers: <code bash>fastor-stop</code>
  - Wait for the inserts to complete in the database: <code bash>clickhouse-client --query="select * from system.processes sp where sp.query like 'insert into%'" | wc -l</code>
  - Stop the database: <code bash>fastor-db-stop</code>

**Step 2.** Clear the yum cache:
<code bash>yum clean all</code>

**Step 3.** Run the installation script to update the repositories:
<code bash>source <(curl https://vasexperts.ru/install/fastor-rpm_install.sh)</code>

<note important>The script will not be completed successfully. The script output will contain errors indicating that ClickHouse dependencies cannot be resolved.</note>

**Step 4.** Check the output of the command:
<code bash>rpm -qa | grep clickhouse</code>

If the output shows different states for all packages:
<code>
clickhouse-client-23.4.2.11-1.x86_64 
clickhouse-server-23.4.2.11-1.x86_64 
clickhouse-common-static-23.4.2.11-1.x86_64
</code>

then you need to remove these packages:
<code bash>rpm -e fastor clickhouse-client-23.4.2.11-1.x86_64 clickhouse-server-23.4.2.11-1.x86_64 clickhouse-common-static-23.4.2.11-1.x86_64</code>

**Step 5.** Update ClickHouse:
<code bash>yum install clickhouse-common-static-24.2.2.71 clickhouse-server-24.2.2.71 clickhouse-client-24.2.2.71</code>

<note important>The package versions should be exactly as specified in the command</note>

**Step 6.** If the file ''/usr/lib/systemd/system/clickhouse-server.service'' contains the parameter ''TimeoutStartSec=0'', it needs to be removed. This affects the startup of ClickHouse on CentOS 7.

Then run the command:
<code bash>systemctl daemon-reload</code>

**Step 7.** Install the latest version of fastor:
<code bash>yum install fastor</code>

**Step 8.** Restart ClickHouse in repair mode:
<code bash>fastor-db-restart-repair</code>

**Step 9.** Update the database schema:
<code bash>fastor-db-scheme</code>

**Step 10.** Restore the .env file:
<code bash>mv "/var/qoestor/backend/.env.rpmsave" "/var/qoestor/backend/.env"</code>

**Step 11.** Restart the receivers:
<code bash>fastor-restart</code>