Bug 1667292
| Summary: | vrrp_script broken from v1.3.0 with syntax "</dev/tcp/127.0.0.1/22" | |||
|---|---|---|---|---|
| Product: | Red Hat Enterprise Linux 7 | Reporter: | Sangam <sababu> | |
| Component: | keepalived | Assignee: | Ryan O'Hara <rohara> | |
| Status: | CLOSED ERRATA | QA Contact: | Brandon Perkins <bperkins> | |
| Severity: | high | Docs Contact: | ||
| Priority: | unspecified | |||
| Version: | 7.3 | CC: | cfeist, cluster-maint, jomurphy | |
| Target Milestone: | rc | |||
| Target Release: | --- | |||
| Hardware: | x86_64 | |||
| OS: | Linux | |||
| Whiteboard: | ||||
| Fixed In Version: | keepalived-1.3.5-16.el7 | Doc Type: | If docs needed, set a value | |
| Doc Text: | Story Points: | --- | ||
| Clone Of: | ||||
| : | 1699041 (view as bug list) | Environment: | ||
| Last Closed: | 2019-08-06 13:13:24 UTC | Type: | Bug | |
| Regression: | --- | Mount Type: | --- | |
| Documentation: | --- | CRM: | ||
| Verified Versions: | Category: | --- | ||
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | ||
| Cloudforms Team: | --- | Target Upstream Version: | ||
| Embargoed: | ||||
| Bug Depends On: | ||||
| Bug Blocks: | 1699041 | |||
Upstream patch: https://github.com/acassen/keepalived/commit/5cd5fff78de11178c51ca245ff5de61a86b85049 Modified the patch to fix uninitialized variable that was causing segfault. Should be working now. Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://access.redhat.com/errata/RHSA-2019:2285 |
Description of problem: vrrp_script broken from v1.3.0 when we try to verify local port with "</dev/tcp/127.0.0.1/22" Version-Release number of selected component (if applicable): Starting keepalived v1.3.0 How reproducible: We can reproduce with a normal keepalived setup with a vrrp_script to check a local port "22" using the below syntax. vrrp_script chk_sshd { script "</dev/tcp/127.0.0.1/22" } Steps to Reproduce: 1. Configure keepalived with vrrp_script as shown above. 2. start keepalived, vrrp_script fails. 3. Actual results: Vrrp_script fails and gets disabled. Expected results: vrrp_script should succeed. Additional info: Keepalived configuration ======================== [root@keepalived-master keepalived]# cat keepalived.conf ! Configuration File for keepalived vrrp_script chk_sshd { script "</dev/tcp/127.0.0.1/22" } vrrp_instance VI_1 { state MASTER interface ens12 virtual_router_id 80 smtp_alert priority 110 advert_int 1 authentication { auth_type PASS auth_pass 056282 } virtual_ipaddress { 192.168.101.200/24 dev ens12 } track_script { chk_sshd } } Logs showing failure ===================== Jan 15 12:19:34 keepalived-master systemd[1]: Stopping LVS and VRRP High Availability Monitor... Jan 15 12:19:34 keepalived-master Keepalived_vrrp[3672]: VRRP_Instance(VI_1) sent 0 priority Jan 15 12:19:34 keepalived-master Keepalived_vrrp[3672]: VRRP_Instance(VI_1) removing protocol VIPs. Jan 15 12:19:35 keepalived-master systemd[1]: Starting LVS and VRRP High Availability Monitor... Jan 15 12:19:35 keepalived-master systemd[1]: PID file /var/run/keepalived.pid not readable (yet?) after start. Jan 15 12:19:35 keepalived-master Keepalived[3699]: Starting Healthcheck child process, pid=3700 Jan 15 12:19:35 keepalived-master Keepalived[3699]: Starting VRRP child process, pid=3701 Jan 15 12:19:35 keepalived-master systemd[1]: Started LVS and VRRP High Availability Monitor. Jan 15 12:19:35 keepalived-master Keepalived_healthcheckers[3700]: Initializing ipvs Jan 15 12:19:35 keepalived-master Keepalived_healthcheckers[3700]: Opening file '/etc/keepalived/keepalived.conf'. Jan 15 12:19:35 keepalived-master Keepalived_vrrp[3701]: Registering Kernel netlink reflector Jan 15 12:19:35 keepalived-master Keepalived_vrrp[3701]: Registering Kernel netlink command channel Jan 15 12:19:35 keepalived-master Keepalived_vrrp[3701]: Registering gratuitous ARP shared channel Jan 15 12:19:35 keepalived-master Keepalived_vrrp[3701]: Opening file '/etc/keepalived/keepalived.conf'. Jan 15 12:19:35 keepalived-master Keepalived_vrrp[3701]: WARNING - default user 'keepalived_script' for script execution does not exist - please create. Jan 15 12:19:35 keepalived-master Keepalived_vrrp[3701]: Unable to access script ``</dev/tcp/127.0.0.1/22`` Jan 15 12:19:35 keepalived-master Keepalived_vrrp[3701]: Disabling track script chk_sshd since not found Jan 15 12:19:35 keepalived-master Keepalived_vrrp[3701]: VRRP_Instance(VI_1) removing protocol VIPs. NOTE : If we use 'bash -c /dev/tcp/127.0.0.1/22' it works with v1.3.0 as well. However the documentation refers to the above syntax. It seems to be fixed upstream, please refer below. https://github.com/acassen/keepalived/commit/5cd5fff78de11178c51ca245ff5de61a86b85049 Its easily reproducible locally with the above configuration.