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mysql-server-liveness-checker.sh
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mysql-server-liveness-checker.sh
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#!/usr/bin/env bash
# debugging switches
# set -o errexit # abort on nonzero exitstatus; same as set -e
# set -o nounset # abort on unbound variable; same as set -u
# set -o pipefail # don't hide errors within pipes
# set -o xtrace # show commands being executed; same as set -x
# set -o verbose # verbose mode; same as set -v
source /srv/timbos-hn-reader/functions.sh
source /srv/timbos-hn-reader/thnr-common-functions.sh
# for write-log-message
project_base_dir="/srv/timbos-hn-reader/"
all_logs_dir="${project_base_dir}logs/"
combined_log_identifier="combined"
server_name=thnr
TZ=UTC
utility_account_username=tim
log_prefix_local="mysql-server-liveness-checker.sh: "
remote_host_nickname="mysql"
remote_host_ip="$(get-secret 'mysql_server_host_ip')"
# mysql_server_hostname="$(get-secret 'mysql_server_hostname')"
remote_host_port_of_interest="$(get-secret 'mysql_server_port')"
nmap_xml="$(create-nmap-xml "${remote_host_ip}")"
remote_host_is_reachable="$(is-host-reachable "${remote_host_ip}" "${nmap_tempfile}")"
remote_host_port_of_interest_state="$(get-port-state "${remote_host_ip}" "${remote_host_port_of_interest}" "${nmap_tempfile}")"
if [[ -z "${remote_host_port_of_interest_state}" ]]; then
remote_host_port_of_interest_state="no-response"
fi
if [[ "${remote_host_is_reachable}" == "true" ]]; then
log_message="${log_prefix_local} nmap: host ${remote_host_ip} is reachable, and its port ${remote_host_port_of_interest} is ${remote_host_port_of_interest_state}"
echo "${log_message}"
write-log-message liveness info "${log_message}" false
"${project_base_dir}send-dashboard-event-to-kafka2.sh" \
"timestamps" "$(get-time-in-unix-seconds)" "" \
"operation" "update-text-content" \
"elementId" "${remote_host_nickname}-host-status-value" \
"value" "reachable"
"${project_base_dir}send-dashboard-event-to-kafka2.sh" \
"operation" "update-color" \
"elementId" "${remote_host_nickname}-host-status-value" \
"value" "green"
"${project_base_dir}send-dashboard-event-to-kafka2.sh" \
"timestamps" "$(get-time-in-unix-seconds)" "" \
"operation" "update-text-content" \
"elementId" "${remote_host_nickname}-host-${remote_host_nickname}-port-status-value" \
"value" "${remote_host_port_of_interest_state}"
if [[ "${remote_host_port_of_interest_state}" == "open" ]]; then
"${project_base_dir}send-dashboard-event-to-kafka2.sh" \
"operation" "update-color" \
"elementId" "${remote_host_nickname}-host-${remote_host_nickname}-port-status-value" \
"value" "green"
else
"${project_base_dir}send-dashboard-event-to-kafka2.sh" \
"operation" "update-color" \
"elementId" "${remote_host_nickname}-host-${remote_host_nickname}-port-status-value" \
"value" "red"
fi
elif [[ "${remote_host_is_reachable}" == "false" ]]; then
log_message="${log_prefix_local} nmap: host ${remote_host_ip} is not reachable"
echo "${log_message}"
write-log-message liveness error "${log_message}" false
"${project_base_dir}send-dashboard-event-to-kafka2.sh" \
"timestamps" "$(get-time-in-unix-seconds)" "" \
"operation" "update-text-content" \
"elementId" "${remote_host_nickname}-host-status-value" \
"value" "not reachable"
"${project_base_dir}send-dashboard-event-to-kafka2.sh" \
"operation" "update-color" \
"elementId" "${remote_host_nickname}-host-status-value" \
"value" "red"
"${project_base_dir}send-dashboard-event-to-kafka2.sh" \
"timestamps" "$(get-time-in-unix-seconds)" "" \
"operation" "update-text-content" \
"elementId" "${remote_host_nickname}-host-${remote_host_nickname}-port-status-value" \
"value" "—"
fi
# "${project_base_dir}send-dashboard-event-to-kafka2.sh" \
# "operation" "update-text-content" \
# "elementId" "${remote_host_nickname}-status-last-updated-iso8601" \
# "value" "$(get-iso8601-date)"
# check if MySQL server is up (using mysqladmin)
mysql_server_liveness_check_password="$(get-secret 'mysql_server_liveness_check_password')"
mysql_server_liveness_check_username="$(get-secret 'mysql_server_liveness_check_username')"
thnr_scraper_host_ip="$(get-secret 'thnr_scraper_host_ip')"
if [[ -z "${mysql_server_liveness_check_username}" ]]; then
log_message="${log_prefix_local} mysqladmin: could not retrieve MySQL username from secrets file"
echo "${log_message}"
write-log-message liveness error "${log_message}" false
exit 1
fi
liveness_check_output=$(mysqladmin \
--bind-address "${thnr_scraper_host_ip}" \
--connect-timeout 8 \
--host "${remote_host_ip}" \
--no-beep \
--password="${mysql_server_liveness_check_password}" \
--port "${remote_host_port_of_interest}" \
--user "${mysql_server_liveness_check_username}" \
--verbose \
ping 2>&1)
# echo ${liveness_check_output}
# success
if [[ "${liveness_check_output}" == *"mysqld is alive"* ]]; then
log_message="${log_prefix_local} mysqladmin: MySQL server at ${remote_host_ip}:${remote_host_port_of_interest} is up"
echo "${log_message}"
write-log-message liveness info "${log_message}" false
"${project_base_dir}send-dashboard-event-to-kafka2.sh" \
"timestamps" "$(get-time-in-unix-seconds)" "" \
"operation" "update-text-content" \
"elementId" "${remote_host_nickname}-host-status-value" \
"value" "up"
"${project_base_dir}send-dashboard-event-to-kafka2.sh" \
"operation" "update-color" \
"elementId" "my${remote_host_nickname}sql-host-status-value" \
"value" "green"
"${project_base_dir}send-dashboard-event-to-kafka2.sh" \
"timestamps" "$(get-time-in-unix-seconds)" "" \
"operation" "update-text-content" \
"elementId" "${remote_host_nickname}-server-status-value" \
"value" "up"
"${project_base_dir}send-dashboard-event-to-kafka2.sh" \
"operation" "update-color" \
"elementId" "${remote_host_nickname}-server-status-value" \
"value" "green"
"${project_base_dir}send-dashboard-event-to-kafka2.sh" \
"timestamps" "$(get-time-in-unix-seconds)" "" \
"operation" "update-text-content" \
"elementId" "${remote_host_nickname}-status-last-updated-iso8601" \
"value" "$(get-iso8601-date)"
fi
# mysqladmin can connect to host, but no MySQL server is detected
if [[ "${liveness_check_output}" == *"Can't connect to MySQL server on"* ]]; then
log_message="${log_prefix_local} mysqladmin: could not connect to a MySQL server at ${remote_host_ip}:${remote_host_port_of_interest}"
echo "${log_message}"
write-log-message liveness error "${log_message}" false
"${project_base_dir}send-dashboard-event-to-kafka2.sh" \
"timestamps" "$(get-time-in-unix-seconds)" "" \
"operation" "update-text-content" \
"elementId" "${remote_host_nickname}-host-status-value" \
"value" "up"
"${project_base_dir}send-dashboard-event-to-kafka2.sh" \
"operation" "update-color" \
"elementId" "${remote_host_nickname}-host-status-value" \
"value" "green"
"${project_base_dir}send-dashboard-event-to-kafka2.sh" \
"timestamps" "$(get-time-in-unix-seconds)" "" \
"operation" "update-text-content" \
"elementId" "${remote_host_nickname}-server-status-value" \
"value" "down"
"${project_base_dir}send-dashboard-event-to-kafka2.sh" \
"operation" "update-color" \
"elementId" "${remote_host_nickname}-server-status-value" \
"value" "red"
# "${project_base_dir}send-dashboard-event-to-kafka2.sh" \
# "operation" "update-text-content" \
# "elementId" "${remote_host_nickname}-status-last-updated-iso8601" \
# "value" "$(get-iso8601-date)"
fi
# # mysqladmin cannot resolve the hostname
# if echo "${liveness_check_output}" | grep "Unknown MySQL server host"; then
# log_message="${log_prefix_local} mysqladmin: host ${remote_host_ip} could not be resolved"
# echo "${log_message}"
# write-log-message liveness error "${log_message}"
# fi
exit 0