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======Update======
<note tip>[[en:dpi:qoe_analytics:implementation_administration:installation_update:update#update_on_centos_7|Instructions for updating on CentOS 7]]</note>
<note warning>**Important!**\\ Do not disable the standard firewall-cmd. The installation script uses it for self-configuration.\\ Do not use the command ''yum update fastor''. Install or update using the script below.</note>
If you have a large amount of incoming data, before updating it is recommended to:
  - Stop receivers: <code>fastor-stop</code>
  - Wait for database insertions to finish: <code>clickhouse-client --query="select * from system.processes sp where sp.query like 'insert into%'" | wc -l</code>
  - Stop the database: <code>fastor-db-stop</code>
  - Run the script ''fastor-rpm_install.sh'': <code>source <(curl https://vasexperts.ru/install/fastor-rpm_install.sh)</code>

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

Due to certain limitations in ClickHouse, it was necessary to modify the dependencies of the fastor package. These changes ensure proper operation on CentOS 8 and VEOS, but may cause issues on CentOS 7 due to unresolved dependencies.

==== Step-by-step guide ====
**Step 1.** If you have large data volumes, before updating it is recommended to:
  - Stop receivers: <code bash>fastor-stop</code>
  - Wait for database insertions to finish: <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 repositories:
<code bash>source <(curl https://vasexperts.ru/install/fastor-rpm_install.sh)</code>

<note important>The script will not complete successfully. The 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 listed packages have different states:
<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 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 must match those specified in the command.</note>

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

Then execute 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 recovery 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 receivers:
<code bash>fastor-restart</code>