81 lines
3.0 KiB
Bash
81 lines
3.0 KiB
Bash
# The control node: ansible-core, and greg with an SSH key and his project.
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pkg_installed ansible-core || { echo ansible-core >>"$LAB_STATE/missing"; pkg_install ansible-core; }
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user_add greg
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runuser -u greg -- ssh-keygen -q -t ed25519 -N '' -f /home/greg/.ssh/id_ed25519
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install -d -m 755 -o greg -g greg /home/greg/ansible
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cat >/home/greg/ansible/ansible.cfg <<'X'
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[defaults]
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inventory = inventory
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remote_user = devops
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host_key_checking = false
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[privilege_escalation]
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become = true
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X
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printf '[webservers]\nnode1\nnode2\nnode3\n' >/home/greg/ansible/inventory
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chown greg: /home/greg/ansible/ansible.cfg /home/greg/ansible/inventory
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# The managed nodes, each with devops: greg's key and passwordless sudo.
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nodes_up 3
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for n in $(nodes_names); do
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in_node $n 'useradd -m devops && echo "devops ALL=(ALL) NOPASSWD: ALL" >/etc/sudoers.d/devops && chmod 440 /etc/sudoers.d/devops && install -d -m 700 -o devops -g devops /home/devops/.ssh'
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in_node -i $n 'install -m 600 -o devops -g devops /dev/stdin /home/devops/.ssh/authorized_keys' </home/greg/.ssh/id_ed25519.pub
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done
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# Nodes share the VM's memory. So that node3 is a small host, each node
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# gets its own /proc/meminfo (and /sys/block): bind mounts made from the VM
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# into the node, again at every boot by le-lab-node-hw.service.
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# NAME MEMORY-MiB DISK:GiB...
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cat >"$LAB_STATE/hardware" <<'X'
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node1 4096 vda:20
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node2 4096 vda:20
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node3 1024 vda:20
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X
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cat >"$LAB_STATE/hardware.sh" <<'X'
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#!/bin/bash
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cd "$(dirname "$0")" || exit 1
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while read -r name mem disks; do
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pid=$(podman inspect -f '{{.State.Pid}}' "$name" 2>/dev/null)
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[ "${pid:-0}" -gt 0 ] || continue
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for m in /proc/meminfo /sys/block; do
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nsenter -t "$pid" -m findmnt -n --mountpoint "$m" >/dev/null && nsenter -t "$pid" -m umount "$m"
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done
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podman exec -i "$name" bash -s -- "$mem" $disks <<'Y'
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d=/var/lib/le-lab-hw mem=$1; shift
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rm -rf $d; mkdir -p $d/block
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awk -v kb=$((mem * 1024)) '
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/^MemTotal:/ { printf "MemTotal: %8d kB\n", kb; next }
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/^(MemFree|MemAvailable):/ { printf "%-16s%8d kB\n", $1, kb / 2; next }
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{ print }' /proc/meminfo >$d/meminfo
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for x; do
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b=$d/block/${x%%:*}
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mkdir -p $b/device $b/queue
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echo $((${x#*:} * 2097152)) >$b/size
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echo 0 >$b/removable; echo 1 >$b/queue/rotational
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echo 512 >$b/queue/logical_block_size; echo 512 >$b/queue/physical_block_size
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echo "Virtual disk" >$b/device/model
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done
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Y
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nsenter -t "$pid" -m mount --bind /var/lib/le-lab-hw/meminfo /proc/meminfo
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nsenter -t "$pid" -m mount --bind /var/lib/le-lab-hw/block /sys/block
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done <hardware
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X
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cat >/etc/systemd/system/le-lab-node-hw.service <<X
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[Unit]
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Description=LINUXexpert practice lab: each node's memory and disks
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After=le-lab-nodes.service
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[Service]
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Type=oneshot
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RemainAfterExit=yes
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ExecStart=/bin/bash $LAB_STATE/hardware.sh
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[Install]
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WantedBy=multi-user.target
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X
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systemctl daemon-reload
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systemctl enable --quiet --now le-lab-node-hw.service
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# Ready to go: greg reaches every node as root.
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timeout 120 runuser -l greg -c 'cd ~/ansible && ansible all -o -a id' </dev/null | grep -c 'uid=0(root)' | grep -qx 3
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