2020-11-04 22:35:10 +01:00
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# Sysop
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## Prometheus
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### Reload config
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:::shell
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curl -X POST -u simon:$(pass sbruder.de/prometheus|head -n1) https://prometheus.sbruder.de/-/reload
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### Remove certain time range from Prometheus
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Requires [TSDB Admin APIs to be
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enabled](https://prometheus.io/docs/prometheus/latest/querying/api/#tsdb-admin-apis)
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(`--web.enable-admin-api`)
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:::shell
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curl -u user:pass -X POST -g 'https://prometheus-endpoint/api/v1/admin/tsdb/delete_series?match[]=metric{label="foo"}&start=TIMESTAMP&end=TIMESTAMP
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2021-04-02 17:43:22 +02:00
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### Add synthetic alert to alertmanager
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:::javascript
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await fetch("/alertmanager/api/v1/alerts", {method: "POST", body: JSON.stringify([{ "labels": {"alertname": "testalert"}, "annotations": { "description": "manual test alert"}}])})
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2020-11-04 22:35:10 +01:00
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## OpenSSL
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### Get certificate expiry date
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:::shell
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openssl s_client -connect hostname:443 2>& /dev/null <<< '' | openssl x509 -noout -dates
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# starttls
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openssl s_client -connect hostname:587 -starttls smtp 2>& /dev/null <<< '' | openssl x509 -noout -dates
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## Docker
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### List images by size
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:::shell
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docker image ls --format "table {{.Size}}\t{{.Repository}}:{{.Tag}}\t{{.ID}}"|sort -h
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### Enable IPv6 NAT
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Makes no sense on first and second thought, but after a while it seems like the
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right thing.
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`/etc/docker/daemon.json`:
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:::json
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{
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"ipv6": true,
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"fixed-cidr-v6": "fd00:d0ce:d0ce:d0ce::/64"
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}
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<!--
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This is the right way, but since I did not get `netfilter-persistent` to work,
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I have to use iptables.
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:::shell
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nft add table ip6 nat
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nft add chain ip6 nat postrouting \{ type nat hook postrouting priority 100 \; \}
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nft add rule ip6 nat postrouting ip6 saddr fd00:d0ce:d0ce:d0ce::/64 masquerade
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-->
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:::shell
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ip6tables -t nat -A POSTROUTING -s fd00:d0ce:d0ce:d0ce::/64 -j MASQUERADE
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ip6tables-save > /etc/iptables/rules.v6
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Publishing a port will still use the userland proxy. If you do not want this,
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have a look at <https://github.com/robbertkl/docker-ipv6nat>.
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:::shell
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docker run -d --restart=always -v /var/run/docker.sock:/var/run/docker.sock:ro --cap-drop=ALL --cap-add=NET_RAW --cap-add=NET_ADMIN --cap-add=SYS_MODULE --net=host robbertkl/ipv6nat
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## Misc
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### Add swap file
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:::shell
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fallocate -l 1G /swapfile
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chmod 600 /swapfile
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mkswap /swapfile
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swapon /swapfile
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