小编给大家分享一下gdb如何调试ceph的radosgw，希望大家阅读完这篇文章之后都有所收获，下面让我们一起去探讨吧！
#gdb调试 rgw
修改gdb配置，设置为保存历史命令，p变量美化输出等
计算
安全
数据库
网络和加速
企业服务
[root@ceph04 src]# cat ~/.gdbinit
set history save on
set print pretty on
set pagination off
set confirm off切换到ceph04（10.254.3.81）的/home/yuliyang/ceph/src [root@ceph04 src]# pwd /home/yuliyang/ceph/src 使用vstart方式启动一个集群
./vstart.sh -d -n -X -r --short
创建admin用户
./radosgw-admin user create --uid=admin --display-name=admin --access-key=admin --secret=adminrgw在8000端口 ps查看进程号
[root@ceph04 src]# ps aux|grep ceph
root 10486 1.5 0.1 404376 201076 pts/2 Sl 11:40 1:22 ./ceph-mon -i a -c /home/yuliyang/ceph/src/ceph.conf
root 10501 0.9 0.1 413592 202224 pts/2 Sl 11:40 0:54 ./ceph-mon -i b -c /home/yuliyang/ceph/src/ceph.conf
root 10520 0.9 0.1 413592 201968 pts/2 Sl 11:40 0:51 ./ceph-mon -i c -c /home/yuliyang/ceph/src/ceph.conf
root 10854 0.6 0.1 899744 226972 ? Ssl 11:40 0:35 ./ceph-osd -i 0 -c /home/yuliyang/ceph/src/ceph.conf
root 11067 0.6 0.1 899748 226280 ? Ssl 11:40 0:34 ./ceph-osd -i 1 -c /home/yuliyang/ceph/src/ceph.conf
root 11304 0.5 0.1 898720 222624 ? Ssl 11:40 0:31 ./ceph-osd -i 2 -c /home/yuliyang/ceph/src/ceph.conf
root 11634 0.0 0.1 351560 157888 ? Ssl 11:40 0:01 ./ceph-mds -i a -c /home/yuliyang/ceph/src/ceph.conf
root 11723 0.0 0.1 383336 164808 ? Ssl 11:40 0:03 ./ceph-mds -i b -c /home/yuliyang/ceph/src/ceph.conf
root 11826 0.0 0.1 351556 158000 ? Ssl 11:40 0:01 ./ceph-mds -i c -c /home/yuliyang/ceph/src/ceph.conf
root 12282 0.1 0.1 12470764 209416 ? Ssl 11:40 0:05 /home/yuliyangceph/src/.libs/lt-radosgw -c /home/yuliyang/ceph/src/ceph.conf --log-file=/home/yuliyang/ceph/src/out/rgw.log --debug-rgw=20 --debug-ms=1
root 22717 0.0 0.0 112648 952 pts/2 S+ 13:11 0:00 grep --color=auto cephattach进程
gdb attach 12282
打断点
(gdb) b process_request Breakpoint 1 at 0x7f465253ea20: file rgw/rgw_process.cc, line 37. (gdb) b rgw/rgw_process.cc:38 Breakpoint 2 at 0x7f465253ea2f: file rgw/rgw_process.cc, line 38. (gdb) b rgw/rgw_process.cc:39 Breakpoint 3 at 0x7f465253ea39: file rgw/rgw_process.cc, line 39.
运行
(gdb) c
Continuing.
[New Thread 0x7f462c7f8700 (LWP 23422)]
[Thread 0x7f463c1ae700 (LWP 21983) exited]
[Thread 0x7f463c5b2700 (LWP 21980) exited]
[New Thread 0x7f465c472700 (LWP 23425)]卡住在此。。。 执行创建100个桶，间隔1000s
for i in `seq 1 100`;do s3cmd -c yuliyang.s3cfg mb s3://test-$i ;sleep 1000 ;done;在断点处停住
(gdb) c
Continuing.
[New Thread 0x7f462c7f8700 (LWP 23422)]
[Thread 0x7f463c1ae700 (LWP 21983) exited]
[Thread 0x7f463c5b2700 (LWP 21980) exited]
[New Thread 0x7f465c472700 (LWP 23425)]
[Switching to Thread 0x7f453affd700 (LWP 12363)]
Breakpoint 1, process_request (store=0x7f465dd42840, rest=0x7ffd760c17e0, req=0x7f453affa800, client_io=0x7f453affa940, olog=0x0) at rgw/rgw_process.cc:37
37 {
(gdb)ctr x a 打开tui 发现停在断点处
n下一步，继续若干n后
查看userinfo
(gdb) p userinfo
$2 = {
auid = 0,
user_id = {
tenant = "",
id = ""
},
display_name = "",
user_email = "",
access_keys = std::map with 0 elements,
swift_keys = std::map with 0 elements,
subusers = std::map with 0 elements,
suspended = 0 '\000',
max_buckets = 1000,
op_mask = 7,
caps = {
caps = std::map with 0 elements
},
system = 0 '\000',
default_placement = "",
placement_tags = empty std::list,
bucket_quota = {
max_size_kb = -1,
max_objects = -1,
enabled = false,
max_size_soft_threshold = -1,
max_objs_soft_threshold = -1
},
temp_url_keys = std::map with 0 elements,
user_quota = {
max_size_kb = -1,
max_objects = -1,
enabled = false,
max_size_soft_threshold = -1,
max_objs_soft_threshold = -1
}
}list查看当前断点处周围的代码
(gdb) list
56 s->obj_ctx = &rados_ctx;
57
58 s->req_id = store->unique_id(req->id);
59 s->trans_id = store->unique_trans_id(req->id);
60 s->host_id = store->host_id;
61
62 req->log_format(s, "initializing for trans_id = %s", s->trans_id.c_str());
63
64 RGWOp* op = NULL;
65 int init_error = 0;继续n执行,查看*s变量
(gdb) p *s
$3 = {
cct = 0x7f465dcc5e10,
cio = 0x0,
req = 0x6,
op = OP_UNKNOWN,
op_type = RGW_OP_UNKNOWN,
content_started = false,
format = 0,
formatter = 0x0,
decoded_uri = "",
relative_uri = "",
length = 0x0,
content_length = 0,
generic_attrs = std::map with 0 elements,
err = {
http_ret = 200,
ret = 0,
s3_code = "",
message = ""
},
expect_cont = false,
header_ended = false,
obj_size = 0,
enable_ops_log = false,
enable_usage_log = false,
defer_to_bucket_acls = 0 '\000',
perm_mask = 0,
header_time = {
tv = {
tv_sec = 0,
tv_nsec = 0
}
},
account_name = "",
bucket_tenant = "",
bucket_name = "",
bucket = {
tenant = "",
name = "",
data_pool = "",
data_extra_pool = "",
index_pool = "",
marker = "",
bucket_id = "",
oid = ""
},
object = {
name = "",
instance = ""
},
src_tenant_name = "",
src_bucket_name = "",
src_object = {
name = "",
instance = ""
},
bucket_owner = {
id = {
tenant = "",
id = ""
},
display_name = ""
},
owner = {
id = {
tenant = "",
id = ""
},
display_name = ""
},
zonegroup_name = "",
zonegroup_endpoint = "",
bucket_instance_id = "",
bucket_instance_shard_id = -1,
redirect = "",
bucket_info = {
bucket = {
tenant = "",
name = "",
data_pool = "",
data_extra_pool = "",
index_pool = "",
marker = "",
bucket_id = "",
oid = ""
},
owner = {
tenant = "",
id = ""
},
flags = 0,
zonegroup = "",
creation_time = {
__d = {
__r = 0
}
},
placement_rule = "",
has_instance_obj = false,
objv_tracker = {
read_version = {
ver = 0,
tag = ""
},
write_version = {
ver = 0,
tag = ""
}
},
ep_objv = {
ver = 0,
tag = ""
},
quota = {
max_size_kb = -1,
max_objects = -1,
enabled = false,
max_size_soft_threshold = -1,
max_objs_soft_threshold = -1
},
num_shards = 0,
bucket_index_shard_hash_type = 0 '\000',
static NUM_SHARDS_BLIND_BUCKET = 4294967295,
requester_pays = false,
has_website = false,
website_conf = {
redirect_all = {
protocol = "",
hostname = "",
http_redirect_code = 0
},
index_doc_suffix = "",
error_doc = "",
routing_rules = {
rules = empty std::list
}
},
index_type = (unknown: 805334416),
swift_versioning = false,
swift_ver_location = ""
},
bucket_attrs = std::map with 0 elements,
bucket_exists = false,
has_bad_meta = false,
user = 0x7f453affa060,
bucket_acl = 0x0,
object_acl = 0x0,
system_request = false,
aws4_auth_needs_complete = false,
aws4_auth = 0x0,
canned_acl = "",
has_acl_header = false,
http_auth = 0x0,
local_source = false,
prot_flags = 0,
os_auth_token = 0x0,
swift_user = "",
swift_groups = "",
content_disp = {
override = "",
fallback = ""
},
host_id = "",
info = {
env = 0x7f453affa950,
args = {
str = "",
empty_str = "",
val_map = std::map with 0 elements,
sys_val_map = std::map with 0 elements,
sub_resources = std::map with 0 elements,
has_resp_modifier = false,
admin_subresource_added = false
},
x_meta_map = std::map with 0 elements,
host = "127.0.0.1",
method = 0x7f4530017e38 "PUT",
script_uri = "/test-1/", 请求创建的桶名字
request_uri = "/test-1/",
request_uri_aws4 = "",
effective_uri = "",
request_params = "",
domain = ""
},
init_state = {
url_bucket = "",
src_bucket = ""
},
time = {
tv = {
tv_sec = 1470979550,
tv_nsec = 592751627
}
},
obj_ctx = 0x0,
dialect = "",
req_id = "",
trans_id = ""
}查看结构体*s的其他信息
(gdb) p (*s).req_id
$4 = "8e78e271-aa38-4121-bfc5-c9a74b816fc5.4115.9"
(gdb) p (*s).trans_id
$5 = "tx", '0' <repeats 20 times>, "9-0057ad5e60-1013-default"
(gdb) p (*s).host_id
$6 = ""继续n，直到get_handler函数，按s进入函数
因为是put类型
直接break退出 查看op类型是create_bucket
查看当前线程
(gdb) thread
[Current thread is 106 (Thread 0x7f4538ff9700 (LWP 12367))]
q退出
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原文链接：https://my.oschina.net/leeyoung/blog/777636
