github.com/m3db/m3@v1.5.0/scripts/m3dbnode_bootstrapped.sh (about)

     1  #!/bin/ash
     2  # shellcheck shell=dash
     3  
     4  # Checks for node health:
     5  # 1. Is there a topology? If not, exit healthy.
     6  # 2. Is the host in the topology? If not, exit healthy.
     7  # 3. Is there a namespace? If not, exit healthy.
     8  # 4. If 1-3 true, check if host reports bootstrapped and exit healthy if so
     9  #    (fail otherwise).
    10  
    11  set -o pipefail
    12  
    13  COORDINATOR_PORT=${COORDINATOR_PORT:-7201}
    14  DBNODE_PORT=${DBNODE_PORT:-9002}
    15  COORD_PLACEMENT_ENDPOINT="http://localhost:${COORDINATOR_PORT}/api/v1/services/m3db/placement"
    16  COORD_NAMESPACE_ENDPOINT="http://localhost:${COORDINATOR_PORT}/api/v1/services/m3db/namespace"
    17  DBNODE_ENDPOINT="http://localhost:${DBNODE_PORT}/health"
    18  
    19  HOSTNAME=${HOSTNAME:-$(hostname)}
    20  
    21  COORD_TMPFILE=$(mktemp)
    22  DBNODE_TMPFILE=$(mktemp)
    23  
    24  cleanup() {
    25    rm -f "$COORD_TMPFILE" "$DBNODE_TMPFILE"
    26  }
    27  
    28  trap cleanup EXIT
    29  
    30  curl --max-time 60 -sSf -o "$COORD_TMPFILE" "$COORD_PLACEMENT_ENDPOINT"
    31  RES=$?
    32  
    33  # Curl exits 22 for 400+ status code. Note this leaves us vulnerable to saying
    34  # bootstrapped if our script makes a bad request and must use caution when
    35  # modifying the script or the coordinator placement endpoint.
    36  if [ "$RES" -eq 22 ]; then
    37    COORD_OUTPUT=$(cat "$COORD_TMPFILE")
    38    echo "Received 4xx from coordinator $COORD_PLACEMENT_ENDPOINT: $COORD_OUTPUT"
    39    exit 0
    40  fi
    41  
    42  # jq -e will exit 1 if the last value was null (or false)
    43  jq -e ".placement.instances | .[\"${HOSTNAME}\"]" < "$COORD_TMPFILE" >/dev/null
    44  RES=$?
    45  
    46  if [ "$RES" -ne 0 ]; then
    47    echo "Host not present in topology"
    48    exit 0
    49  fi
    50  
    51  curl --max-time 60 -sSf -o "$COORD_TMPFILE" "$COORD_NAMESPACE_ENDPOINT"
    52  RES=$?
    53  
    54  if [ "$RES" -eq 22 ]; then
    55    echo "Received 4xx from namespace endpoint $COORD_NAMESPACE_ENDPOINT"
    56    exit 0
    57  fi
    58  
    59  # If there IS a placement but NO namespace, then the dbnode will respond
    60  # connection refused (until https://github.com/m3db/m3/issues/996 is addressed)
    61  # and the health script would fail hereafter. However, if there's no namespaces
    62  # then we want to consider the node healthy because it just doesn't have
    63  # anything to do. So before we ask the dbnode for its health, check if there's
    64  # no namespaces to begin with, and if so exit 0.
    65  NS_COUNT=$(jq '.registry.namespaces | length' < "$COORD_TMPFILE")
    66  if [ "$NS_COUNT" -eq 0 ]; then
    67    echo "No namespaces in cluster"
    68    exit 0
    69  fi
    70  
    71  curl --max-time 60 -sSf -o "$DBNODE_TMPFILE" "$DBNODE_ENDPOINT"
    72  RES=$?
    73  
    74  if [ "$RES" -ne 0 ]; then
    75    echo "Received exit code $RES from curl health $DBNODE_ENDPOINT"
    76    exit 1
    77  fi
    78  
    79  BOOTSTRAPPED=$(jq .bootstrapped < "$DBNODE_TMPFILE")
    80  if [ "$BOOTSTRAPPED" != "true" ]; then
    81    echo "Not bootstrapped ($BOOTSTRAPPED)"
    82    exit 1
    83  fi
    84  
    85  echo "Host bootstrapped"
    86  exit 0