mirror of
https://github.com/edgelesssys/constellation.git
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88 lines
2.7 KiB
Go
88 lines
2.7 KiB
Go
//go:build linux && amd64
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/*
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Copyright (c) Edgeless Systems GmbH
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SPDX-License-Identifier: AGPL-3.0-only
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*/
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package cmd
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import (
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"bufio"
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"fmt"
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"io"
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"os"
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"runtime"
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"strings"
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"golang.org/x/sys/unix"
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)
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// checkSystemRequirements checks if the system meets the requirements for running a MiniConstellation cluster.
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// We do so by verifying that the host:
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// - arch/os is linux/amd64.
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// - has access to /dev/kvm.
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// - has at least 4 CPU cores.
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// - has at least 4GB of memory.
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// - has at least 20GB of free disk space.
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func (m *miniUpCmd) checkSystemRequirements(out io.Writer) error {
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// check arch/os
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if runtime.GOARCH != "amd64" || runtime.GOOS != "linux" {
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return fmt.Errorf("creation of a QEMU based Constellation is not supported for %s/%s, a linux/amd64 platform is required", runtime.GOOS, runtime.GOARCH)
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}
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m.log.Debugf("Checked arch and os")
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// check if /dev/kvm exists
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if _, err := os.Stat("/dev/kvm"); err != nil {
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return fmt.Errorf("unable to access KVM device: %w", err)
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}
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m.log.Debugf("Checked that /dev/kvm exists")
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// check CPU cores
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if runtime.NumCPU() < 4 {
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return fmt.Errorf("insufficient CPU cores: %d, at least 4 cores are required by MiniConstellation", runtime.NumCPU())
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}
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if runtime.NumCPU() < 6 {
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fmt.Fprintf(out, "WARNING: Only %d CPU cores available. This may cause performance issues.\n", runtime.NumCPU())
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}
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m.log.Debugf("Checked CPU cores - there are %d", runtime.NumCPU())
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// check memory
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f, err := os.Open("/proc/meminfo")
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if err != nil {
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return fmt.Errorf("determining available memory: failed to open /proc/meminfo: %w", err)
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}
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defer f.Close()
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var memKB int
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scanner := bufio.NewScanner(f)
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for scanner.Scan() {
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if strings.HasPrefix(scanner.Text(), "MemTotal:") {
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_, err = fmt.Sscanf(scanner.Text(), "MemTotal:%d", &memKB)
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if err != nil {
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return fmt.Errorf("determining available memory: failed to parse /proc/meminfo: %w", err)
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}
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}
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}
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m.log.Debugf("Scanned for available memory")
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memGB := memKB / 1024 / 1024
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if memGB < 4 {
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return fmt.Errorf("insufficient memory: %dGB, at least 4GB of memory are required by MiniConstellation", memGB)
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}
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if memGB < 6 {
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fmt.Fprintln(out, "WARNING: Less than 6GB of memory available. This may cause performance issues.")
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}
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m.log.Debugf("Checked available memory, you have %dGB available", memGB)
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var stat unix.Statfs_t
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if err := unix.Statfs(".", &stat); err != nil {
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return err
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}
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freeSpaceGB := stat.Bavail * uint64(stat.Bsize) / 1024 / 1024 / 1024
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if freeSpaceGB < 20 {
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return fmt.Errorf("insufficient disk space: %dGB, at least 20GB of disk space are required by MiniConstellation", freeSpaceGB)
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}
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m.log.Debugf("Checked for free space available, you have %dGB available", freeSpaceGB)
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return nil
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}
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