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make clickhouseproxy load balance and failover #426

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7 changes: 6 additions & 1 deletion ansible/host_vars/clickhouseproxy.dev.ooni.io/vars.yml
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Original file line number Diff line number Diff line change
@@ -1 +1,6 @@
clickhouse_url: "clickhouse3.prod.ooni.io"
clickhouse_nodes:
#- host: clickhouse1.prod.ooni.io
#- host: clickhouse2.prod.ooni.io
- host: clickhouse3.prod.ooni.io

clickhouse_port: 9000
8 changes: 7 additions & 1 deletion ansible/host_vars/clickhouseproxy.prod.ooni.io/vars.yml
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@@ -1 +1,7 @@
clickhouse_url: "clickhouse1.prod.ooni.io"
clickhouse_nodes:
- host: clickhouse1.prod.ooni.io
#- host: clickhouse2.prod.ooni.io
- host: clickhouse3.prod.ooni.io
backup: true

clickhouse_port: 9000
11 changes: 8 additions & 3 deletions ansible/roles/clickhouse_proxy/templates/99-stream.conf
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@@ -1,12 +1,17 @@
stream {
upstream clickhouse_backend {
server {{ clickhouse_url }}:{{ clickhouse_port }};
{% for n in clickhouse_nodes %}
# node {{ loop.index }}{% if n.backup is defined and n.backup %} (backup){% endif %}
server {{ n.host }}:{{ n.port | default(clickhouse_port) }} max_fails=3 fail_timeout=60s{% if n.backup is defined and n.backup %} backup{% endif %};
{% endfor %}
}

server {
listen 9000;
listen {{ proxy_listen_port | default(9000) }};

proxy_pass clickhouse_backend;
proxy_connect_timeout 3s;
proxy_timeout 600s; # kill idle connections after 10 minutes
proxy_pass clickhouse_backend;
}

error_log /var/log/nginx/error.log;
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