disk_free stats

.gitignore

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+.env

psql

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+#!/usr/bin/env bash
+
+set -e
+
+export $(cat .env | xargs)
+
+psql -w

schema.sql

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+CREATE TABLE host (
+    id SERIAL PRIMARY KEY,
+    created_at TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    name VARCHAR(255) NOT NULL UNIQUE
+);
+
+CREATE TABLE host_uptime (
+    id SERIAL PRIMARY KEY,
+    created_at TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    host_id INT NOT NULL REFERENCES host(id),
+    -- uptime in seconds
+    uptime INT NOT NULL
+);
+
+CREATE TABLE host_mem (
+    id SERIAL PRIMARY KEY,
+    created_at TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    host_id INT NOT NULL REFERENCES host(id),
+    -- available memory in kB
+    mem_avail INT NOT NULL
+);
+
+CREATE TABLE host_disk (
+    id SERIAL PRIMARY KEY,
+    created_at TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT CURRENT_TIMESTAMP,
+    host_id INT NOT NULL REFERENCES host(id),
+    -- free disk space in kB
+    disk_free INT NOT NULL
+);

status

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+#!/usr/bin/env bash
+
+set -e
+
+export $(cat .env | xargs)
+
+psql -w <<EOF
+    WITH host_upsert AS (
+        INSERT INTO host (name) VALUES ('$(hostname)')
+        ON CONFLICT (name) DO UPDATE SET name = EXCLUDED.name
+        RETURNING id
+    )
+    INSERT INTO host_uptime (host_id, uptime)
+    SELECT id, '$(cat /proc/uptime | awk -F. '{print $1}')'
+    FROM host_upsert
+    RETURNING *;
+EOF
+
+psql -w <<EOF
+    WITH host_upsert AS (
+        INSERT INTO host (name) VALUES ('$(hostname)')
+        ON CONFLICT (name) DO UPDATE SET name = EXCLUDED.name
+        RETURNING id
+    )
+    INSERT INTO host_mem (host_id, mem_avail)
+    SELECT id, '$(cat /proc/meminfo | grep 'MemAvailable' | awk '{print $2}')'
+    FROM host_upsert
+    RETURNING *;
+EOF
+
+psql -w <<EOF
+    WITH host_upsert AS (
+        INSERT INTO host (name) VALUES ('$(hostname)')
+        ON CONFLICT (name) DO UPDATE SET name = EXCLUDED.name
+        RETURNING id
+    )
+    INSERT INTO host_disk (host_id, disk_free)
+    SELECT id, '$(df / | awk 'NR==2{print $4}')'
+    FROM host_upsert
+    RETURNING *;
+EOF

template.env

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+PGHOST=
+PGPORT=
+PGUSER=
+PGPASSWORD=
+PGDATABASE=