2025年3月30日，官方发布了Keepalived的最新版，版本号：2.3.3
而2024年11月3日发布的2.3.2版本，在CentOS 7.9上编译的时候，就出现了报错，但是在Alma Linux 8.10上，则可以成功编译安装，当时我就觉得可能从2.3.2版本开始，Keepalived已经不再支持CentOS 7了，但是在这个版本的发布声明中，官方并没有明确提及这个问题。
下载地址：https://keepalived.org/software/keepalived-2.3.3.tar.gz （不再兼容CentOS/Redhat 7.x版本）
相关报错记录详见：https://blog.csdn.net/cnskylee/article/details/143572514
但是，这次的2.3.3版的发布声明文档中，官方已经明确申明，Keepalived 2.3.3版本不再支持CentOS 7系统。
但是，这里让我很不解的是，官方又在 Improvements 说明，允许在非常老的系统中编译（内核版本 < 3.15），不过我在CentOS 7.9系统中编译，还是出现错误，信息如下：
[root@node02 keepalived-2.3.3]# make
Making all in lib
make[1]: 进入目录“/usr/local/src/keepalived-2.3.3/lib”
make all-am
make[2]: 进入目录“/usr/local/src/keepalived-2.3.3/lib”
CC memory.o
CC utils.o
utils.c: 在函数‘dump_buffer’中:
utils.c:106:5: 警告：无法优化可能无穷的循环 [-Wunsafe-loop-optimizations]
for (j = i - 15; j <= i; j++)
^
CC notify.o
CC timer.o
CC scheduler.o
CC vector.o
CC html.o
CC parser.o
CC signals.o
CC logger.o
CC list_head.o
CC rbtree.o
CC process.o
CC json_writer.o
CC rttables.o
AR liblib.a
make[2]: 离开目录“/usr/local/src/keepalived-2.3.3/lib”
make[1]: 离开目录“/usr/local/src/keepalived-2.3.3/lib”
Making all in keepalived
make[1]: 进入目录“/usr/local/src/keepalived-2.3.3/keepalived”
Making all in core
make[2]: 进入目录“/usr/local/src/keepalived-2.3.3/keepalived/core”
CC main.o
main.c: 在函数‘sigend’中:
main.c:1210:34: 警告：assuming signed overflow does not occur when simplifying conditional to constant [-Wstrict-overflow]
for (i = 0; i < NUM_CHILD_TERM && wait_count; i++) {
^
main.c:1232:6: 警告：assuming signed overflow does not occur when simplifying conditional to constant [-Wstrict-overflow]
if (wait_count) {
^
main.c:1169:8: 警告：assuming signed overflow does not occur when simplifying conditional to constant [-Wstrict-overflow]
while (wait_count) {
^
CC daemon.o
CC pidfile.o
CC layer4.o
CC smtp.o
CC global_data.o
CC global_parser.o
CC keepalived_netlink.o
keepalived_netlink.c: 在函数‘rta_addattr_l’中:
keepalived_netlink.c:748:42: 警告：在有符号和无符号整数表达式间比较 [-Wsign-compare]
if (RTA_ALIGN(rta->rta_len) + align_len > maxlen)
^
keepalived_netlink.c: 在函数‘rta_addattr_l2’中:
keepalived_netlink.c:769:42: 警告：在有符号和无符号整数表达式间比较 [-Wsign-compare]
if (RTA_ALIGN(rta->rta_len) + align_len > maxlen)
^
CC namespaces.o
CC track_process.o
CC reload_monitor.o
CC config_notify.o
AR libcore.a
make[2]: 离开目录“/usr/local/src/keepalived-2.3.3/keepalived/core”
Making all in vrrp
make[2]: 进入目录“/usr/local/src/keepalived-2.3.3/keepalived/vrrp”
CC vrrp_daemon.o
CC vrrp_print.o
CC vrrp_data.o
CC vrrp_parser.o
CC vrrp.o
vrrp.c: 在函数‘vrrp_check_packet’中:
vrrp.c:1053:23: 警告：在有符号和无符号整数表达式间比较 [-Wsign-compare]
vrrp->adver_int != (V3_PKT_ADVER_INT_NTOH(hd->v3.adver_int)) * TIMER_CENTI_HZ) {
^
vrrp.c: 在函数‘open_vrrp_read_socket’中:
vrrp.c:2717:103: 错误：‘IPV6_FREEBIND’未声明(在此函数内第一次使用)
if (setsockopt(fd, family == AF_INET ? IPPROTO_IP : IPPROTO_IPV6, family == AF_INET ? IP_FREEBIND : IPV6_FREEBIND, &on, sizeof on))
^
vrrp.c:2717:103: 附注：每个未声明的标识符在其出现的函数内只报告一次
make[2]: *** [vrrp.o] 错误 1
make[2]: 离开目录“/usr/local/src/keepalived-2.3.3/keepalived/vrrp”
make[1]: *** [all-recursive] 错误 1
make[1]: 离开目录“/usr/local/src/keepalived-2.3.3/keepalived”
make: *** [all-recursive] 错误 1
[root@node02 keepalived-2.3.3]# uname -a
Linux node02 3.10.0-1160.119.1.el7.x86_64 #1 SMP Tue Jun 4 14:43:51 UTC 2024 x86_64 x86_64 x86_64 GNU/Linux而这个问题，估计就与3.15版本的内核中新引入的“开放式文件描述符锁-Open file descriptor locks”有关系。